|Coded data generation or conversion patents - Monitor Patents|
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Coded data generation or conversion June invention type 06/09Below are recently published patent applications awaiting approval from the USPTO. Recent week's RSS XML file available below.
Listing for abstract view: USPTO application #, Title, Abstract excerpt,Patent Agent. Listing format for list view: USPTO National Class full category number, title of the patent application. 06/25/2009 > patent applications in patent subcategories.
20090160680 - Electronic apparatus and input interface thereof: An electronic apparatus includes an input interface, a controller and a processor. The input interface includes a central touch sensing region and a peripheral touch sensing region. The central touch sensing region has a central touch pad disposed therein, and the peripheral sensing region surrounds the central touch sensing region... Agent: North America Intellectual Property Corporation
20090160681 - Numeiric keyboard device with voice interaciton and the method thereof: The numeric keyboard device of the present invention includes a key matrix, an audio I/O module for sending and receiving audio signals, an audio microprocessor for processing audio signals sent and received by the audio I/O module, an MCU that scans the key status of the key matrix, and a... Agent: Bacon & Thomas, PLLC
20090160682 - Capacitive sensing device for use in a keypad assembly: One embodiment in accordance with the present invention includes a capacitive sensing device for use in a keypad assembly of an electronic system. The capacitive sensing device includes a substantially transparent single sheet capacitive sensor. The substantially transparent single sheet capacitive sensor is configured to be disposed within the keypad... Agent: Synaptics C/o Wagner Blecher LLP
20090160683 - Portable electronic device with scroll wheel control module: A portable electronic device with scroll wheel control module includes a housing (20), a display (212) and two scroll wheel mechanisms (41,42). Two side walls (220) of the housing having a slot (222) defined therein. Each scroll wheel mechanism includes a main wheel (432), a circuit board (45) a touch... Agent: PCe Industry, Inc. Att. Steven Reiss
20090160684 - Method for encoding and decoding data: Methods for the compression and decompression of data using a super cooling process are described wherein an input stream is manipulated, encoded and summarized to form entities containing precedential relationships representing the input stream in a different form. The super cooled sets may be used in the transmission and/or storage... Agent: Dunlap Codding, P.C.
20090160685 - Enhanced control for compression and decompression of sampled signals: Control of signal compression is coordinated by selectively modifying control parameters affecting the bit rate, sample rate, dynamic range and compression operations. Selected control parameters are modified according to a control function. The control function can include a ratio parameter that indicates the relative or proportional amounts of change to... Agent: Haynes Beffel & Wolfeld LLP
20090160686 - Apparatus of multi-stage network for iterative decoding and method thereof: An apparatus and method of multi-stage network for iterative network are disclosed. The apparatus has M stages, and each stage uses N multiplexers to transmit N codeword partitions simultaneously. Every starting terminal, either the output port of memories, soft-in soft-out decoders, or multiplexers, has two paths to couple with two... Agent: Muncy, Geissler, Olds & Lowe, PLLC
20090160687 - R/d converter and angle detecting apparatus: A band elimination filter 35 that eliminates or reduces a low frequency noise superposed on resolver signals S1 and S2 is provided between a synchronous detection circuit 34 that performs synchronous detection by referring to an excitation signal and a controller 36 that controls a digital angle output φ to... Agent: Gallagher & Lathrop, A Professional Corporation
20090160688 - Ad converter: An AD converter comprising: a delta-sigma-modulation circuit to output an analog signal from a bridge circuit as a quantized signal; a switch circuit to switch between a first state, where a first level voltage is applied to one terminal of the bridge circuit and a second level voltage different in... Agent: SocalIPLaw Group LLP
20090160689 - High speed resistor-based digital-to-analog converter (dac) architecture: A digital to analog converter (DAC) system comprising, a first segment, wherein a segment comprises, a first path including an array of resistors connected in series between a first reference voltage node and a second reference voltage node, wherein the array is connected to a first switch device disposed between... Agent: Cantor Colburn LLP-ibm Burlington
20090160690 - D/a converter circuit, integrated circuit device, and electronic apparatus: A D/A converter circuit which converts a digital signal of n bits into an analog signal and outputs the analog signal comprises: a plurality of D/A conversion processors, each of which converting a digital signal into an analog signal, the digital signal being made by dividing the n-bit digital signal... Agent: Harness, Dickey & Pierce, P.L.C
20090160691 - Digital to analog converter having fastpaths: A resistor-based digital to analog converter (DAC) having mux fastpaths, which selectively connect a subset (or an entirety) of voltage divider nodes in a DAC to either a higher level of multiplexor hierarchy, or a DAC output node, effectively bypassing one or more levels of multiplexor devices. In addition, the... Agent: Ibm Microelectronics Intellectual Property Law
20090160692 - A/d conversion circuit and electronic instrument: An A/D conversion circuit includes an amplifier circuit that includes a plurality of amplifiers that are cascaded, a selector that selects one of output signals output from the plurality of amplifiers and outputs the selected output signal as a selector output signal, an A/D converter that A/D-converts the selector output... Agent: Oliff & Berridge, PLC
20090160693 - A/d conversion circuit and electronic instrument: An A/D conversion circuit includes a continuous-time filter that performs a filtering process on an input signal, an SCF that is provided in a subsequent stage of the continuous-time filter and performs a filtering process utilizing the continuous-time filter as a prefilter, a cut-off frequency of the SCF being variably... Agent: Oliff & Berridge, PLC
20090160694 - Interaction with autonomous consumer electronics devices: Interaction with autonomous consumer devices involves representing, on a mobile device, a target entity that is commonly accessible by applications of the mobile device. The target entity is presented via a legacy inter-application service that is different from a service associated with a target autonomous consumer electronics device. User composition... Agent: Hollingsworth & Funk, LLC
20090160695 - Remote control apparatus: A remote control apparatus is disclosed that includes a display unit, a remote control unit, and a controller. The controller is configured to: causes the display unit to display multiple select switch image items over an image; divide the image into multiple regions in correspondence with the multiple select switch... Agent: Posz Law Group, PLC06/18/2009 > patent applications in patent subcategories.
20090153369 - Apparatus and method for inputting information: An apparatus for inputting information is disclosed. The apparatus includes a first sensor operably configured to be mounted on a user's thumb and a plurality of sensors operably configured to be mounted on the user's fingers, such that the user can move the user's thumb and/or fingers to cause contact... Agent: Kolisch Hartwell, P.C.
20090153367 - Pen-type portable wireless terminal: A pen-type portable wireless terminal is provided. The pen-type portable wireless terminal includes a sensor unit located in an end part of a pen-type housing, the sensor unit to sense movement of the end part; an identification unit to identify at least one of a character and a numeral from... Agent: H.c. Park & Associates, PLC
20090153365 - Portable haptic interface: A portable interface device (1) of haptic human-computer type which can be fixed to a hand (2) of an operator (3), capable of engaging with the operator (3) transmitting on the operator's hand fingertips tactile sensations following the shape of a virtual surface (4), in particular obtained from a real... Agent: Dennison, Schultz & Macdonald
20090153368 - Tactile input/output device and driving method thereof: A tactile input/output device and a driving method thereof are provided. The device includes at least one input end, at least one output end, and a controller. The input end includes a plurality of input cells arranged at regular intervals. The output end includes a plurality of output cells arranged... Agent: Cha & Reiter, LLC
20090153366 - User interface apparatus and method using head gesture: Disclosed is a user interface apparatus and method using a head gesture. A user interface apparatus and method according to an embodiment of the invention matches a specific head gesture of a user with a specific command and stores a matched result, receives image data of a head gesture of... Agent: Ampacc Law Group
20090153370 - Variable compliance joystick with compensation algorithms: The present invention provides variable compliance joysticks with mechanical and software customization, and with an integrated control capability, and a method of systematically determining the best mechanical settings and compensatory algorithms to embed in the joysticks to offer an individual with substantial upper extremity motor impairments a personal fit and... Agent: Dykema Gossett PLLC
20090153371 - Handheld electronic device with rotatable keyboard: An improved handheld electronic device comprises a keypad having a first keypad portion and a second keypad portion. The second keypad portion is movable with respect to the first keypad portion between a first position and a second position such that the second keypad portion moves between a retracted configuration... Agent: Eckert Seamans Cherin & Mellott
20090153373 - Key module for electronic devices: A key module (10) includes a light guiding board (14), a flexible key board (12) disposed on the light guiding board, and a plurality of metallic elastic sheets (164). Each of the metallic elastic sheets is disposed on the light guiding board and located opposite to the flexible key board.... Agent: PCe Industry, Inc. Att. Steven Reiss
20090153372 - Method of transmitting key code of hot key from number pad: In a method of transmitting key codes of hot keys from a number pad, the number pad includes at least one hot key and several key code sets corresponding to the hot keys. Each key code set has key codes formed and edited according to a first key code conversion... Agent: Bacon & Thomas, PLLC
20090153374 - Virtual keypad input device: A compact input device for fast text input. Ten perimeter regions are defined in a decagon shaped ring on a touch pad, and nine more center regions arranged in a 3 by 3 matrix are defined at the center of the perimeter regions. In alphanumeric mode, each of the ten... Agent: Cubic Design Studios LLC
20090153375 - Adjusting soft values to reduce bias: A method is described for adjusting soft values in a code block prior to decoding. A count of saturated soft values in a code block is determined and one or more of the soft values in the code block are adjusted based on the count of saturated soft values. The... Agent: Coats & Bennett, PLLC
20090153376 - Data compression for communication between two or more components in a system: A method includes generating a first symbol string code indicative of one or more positions of a first symbol string within data to be compressed. A second symbol string code indicative of one or more positions of a second symbol string within the data is also generated. The first symbol... Agent: Foley & Lardner LLP
20090153377 - Time to digital converter with error protection: Time to digital converters (TDCs) with high resolution are disclosed. The TDC includes a first time to digital converting module, a selection and time amplifying module, a second time to digital converting module and a decoder, and is applied in estimating a time difference between a first signal and a... Agent: Thomas, Kayden, Horstemeyer & Risley, LLP
20090153378 - Digital signal coding apparatus, digital signal decoding apparatus; digital signal arithmetic coding method, and digital signal arithmetic decoding method: In a bit stream syntax containing compressed video slice data for compressed video data of a slice structure, a slice header for compressed video slice data has attached thereto a slice start code, a register reset flag indicating whether a register value, which designates a status of a codeword occurring... Agent: Birch Stewart Kolasch & Birch
20090153379 - System and method for encoding a signal using compressed sensor measurements: Described is a system and method for receiving a signal for transmission and encoding the signal into a plurality of linear projections representing the signal. The encoding includes defining a transform matrix. The transform matrix being defined by processing the signal using a macroseparation matrix, processing the signal using a... Agent: At & T Legal Department - Fkm
20090153380 - Current compensation for digital-to-analog converter: A current compensation circuit and an optimized current compensation circuit are disclosed for a Parallel Resistors Architecture (PRA) digital-to-analog converter (DAC). The circuits are used to balance code dependent current consumption of the PRA-DAC.... Agent: Fish & Richardson P.C.
20090153382 - Signal processing circuit comprising a sigma delta analog to digital converter: A signal processing circuit comprising a sigma delta analog to digital converter with a feedback loop that comprises an analog filtering circuit (14) that has a controllable time constant. In a calibration mode a detector (18) detects a signal strength in a band (34) of frequencies at an output of... Agent: Nxp, B.v. Nxp Intellectual Property Department
20090153381 - Superconductor analog-to-digital converter: A superconducting Analog-to-Digital Converter (ADC) employing rapid-single-flux-quantum (RSFQ) logic is disclosed. The ADC has only superconductor active components, and is characterized as being an Nth-order bandpass sigma-delta ADC, with the order “N” being at least 2. The ADC includes a sequence of stages, which stages include feedback loops and resonators.... Agent: George Sai-halasz
20090153383 - Digital-to-analogue converter: A digital-to-analogue conversion arrangement is disclosed which includes first and second groups of the same number of bi-directional bufferless digital-to-analogue converters. The output of at least one converter in each group is connected to a respective capacitive load (CLOAD, CLOAD′). During a calibration phase of operation the converter inputs receive... Agent: Harness, Dickey & Pierce, P.L.C
20090153385 - Method and system for a configurable communications interface: An electronic device having a receiver generating an analog signal from collected image data, a digitizer generating a digital signal from the analog signal and a micro-controller receiving the analog signal and the digital signal and generating a corrected digital signal, wherein the device outputs one of the digital signal... Agent: Motorola, Inc.
20090153384 - Method and system for variable resolution data conversion in a receiver: Aspects of a method and system for variable resolution data conversion in a receiver are provided. In this regard, an analog received signal may be converted to a corresponding digital signal, wherein a resolution of the corresponding digital signal may be varied (e.g., by configuring one or more switching elements)... Agent: Mcandrews Held & Malloy, Ltd
20090153387 - Analog/digital converter and information recording and reproducing apparatus: The present invention provides an A/D converter includes: a plurality of comparators for comparing a plurality of respective standard voltages with an analog input value for a magnitude thereof, the comparators being arranged depending on magnitudes of the standard voltages; a logic boundary detector for detecting a logic boundary point... Agent: Robert J. Depke Lewis T. Steadman
20090153386 - Flash converter differential reference ladder auto-zero circuit: A differential reference ladder with an auto zero circuit that can be used as part of a flash analog to digital converter. The auto zero operation is performed relative to a common mode voltage of the ladder. The resistive ladder is disconnected from the rest of the circuit during auto... Agent: Hamilton, Brook, Smith & Reynolds, P.C.
20090153388 - Time interpolation flash adc having automatic feedback calibration: An input signal is compared to 2N−1 reference voltages to generate 2N−1 corresponding binary valued comparison signals, delaying at least one of the comparison signals by a variable delay and detecting a difference in arrival time between the delayed signal and another comparison signal. A time interpolation signal encoding a... Agent: Nxp, B.v. Nxp Intellectual Property Department
20090153390 - Arbitration system and method for use with wireless remote control devices in a multiple video screen entertainment system: An arbitration system and method for use with wireless remote control devices in a multiple video screen entertainment system includes transmitting a control signal from the remote to one or more video devices in the entertainment system. The control signal is received at a video screen where the signal strength... Agent: Delphi Technologies, Inc.
20090153389 - Scroll bar with video region in a media system: An electronic device associated with a remote wand controlling the operations of the electronic device is provided. The wand may include a motion detection component operative to provide an output reflecting the motion of the wand to the electronic device, such that the movements of a cursor displayed by the... Agent: Kramer Levin Naftalis & Frankel LLP06/11/2009 > patent applications in patent subcategories.
20090146847 - System and method for using human recognizable content to communicate with electronic devices: A system for utilizing human-recognizable material to interact with digital content may include human-recognizable content, an electric field generating device adapted to generate an electric field, an electric field emitting device adjacent to the human-recognizable content and in electrical communication with the electric field generating device, the electric field emitting... Agent: Taft, Stettinius & Hollister LLP
20090146848 - Systems to enhance data entry in mobile and fixed environment: A data entry system is provided using a virtual dynamic keypad having at least four keys, wherein to four of the keys at least substantially all of the letters of a language are distributively assigned and wherein the locations of the four letter keys relating to each other are dynamically... Agent: Browdy And Neimark, P.l.l.c. 624 Ninth Street, Nw
20090146849 - Multi-mode multi-parallelism data exchange method and device thereof: A multi-mode multi-parallelism data exchange method and the device thereof are proposed to apply to a check node operator or a bit node operator. The proposed method comprises the steps of: duplicating part or all of an original shift data as a duplicated shift data; combining the original shift data... Agent: Sinorica, LLC
20090146850 - Transmitting/receiving methods and systems for dc balance encoded data including simultaneous switching noise reducing preambles: DC balance encoded data is transmitted by transmitting a preamble of dummy data that is configured to provide an intermediate number of bits of a given logic value that is at least one bit of the given logic value but less than a maximum number of bits of the given... Agent: Myers Bigel Sibley & Sajovec
20090146851 - N-state ripple adder scheme coding with corresponding n-state ripple adder scheme decoding: Methods and apparatus for implementing an n-state ripple-adder scheme coder with n≧2 using an n-state reversible switching function and a non-reversible n-state switching function acting upon a first and a second word of at least 2 n-state symbols are disclosed. Corresponding decoding methods and apparatus are also disclosed. A resulting... Agent: Diehl Servilla LLC
20090146852 - Multi-speed burst mode serializer/de-serializer: A multi-speed burst mode serializer/de-serializer (SerDes). A configurable SerDes can be designed to operate in one of a plurality of operating modes. The plurality of operating modes correspond to the reception of signals from optical network units that operate at different nominal speeds.... Agent: Law Office Of Duane S. Kobayashi
20090146853 - Scalable context adaptive binary arithmetic coding: One embodiment of the invention concerns performing renormalization in content adaptive binary arithmetic coding (CABAC) only after multiple bins are processed.... Agent: Trop, Pruner & Hu, P.C.
20090146854 - Pipeline type a/d converter apparatus provided with precharge circuit for precharging sampling capacitor: In a pipeline type A/D converter apparatus including A/D converter circuit parts connected in cascade with each other and A/D converting a sample hold signal in a pipeline form, each A/D converter circuit part includes a pre-A/D converter circuit for A/D converting an input signal into a digital signal, and... Agent: Wenderoth, Lind & Ponack, L.L.P.
20090146855 - Residue signal generator architecture with reduced number of switches for use in a pipeline adc processing differential signals: A residue block in a stage of a pipeline ADC processing differential signals contains multiple pairs of capacitors. During a hold phase of operation, one capacitor of a pair is connected to a positive reference voltage, and the other capacitor is connected to a negative reference voltage if the input... Agent: Texas Instruments Incorporated
20090146856 - Digital-to-analog converter with r-2r ladder network by polarity control: The present invention provides the voltage generator comprises providing a binary weight digital-to-analog converter (DAC) including an R-2R ladder network, and control switches, and an operation amplifier (OP) with a feedback resistance, and providing a plurality of voltages, from an input of said ladder network, in a positive polarity and... Agent: Stout, Uxa, Buyan & Mullins LLP
20090146857 - Maintaining a reference voltage constant against load variations: A voltage source providing a constant reference voltage, independent of load variations at an output terminal. The effective impedance (looking-in impedance) at the output terminal is designed to be independent of frequency of the signals at the output terminal. In an embodiment, the resistance of one of two parallel impedance... Agent: Texas Instruments Incorporated
20090146858 - Method for operating a sensor system and sensor system: A method is provided for operating a sensor system having a sensor, an analog-to-digital converter and a digital signal-processing device, an analog signal from the sensor being transmitted to the analog-to-digital converter, the analog signal being converted to a digital signal by the analog-to-digital converter with a sampling frequency, the... Agent: Kenyon & Kenyon LLP
20090146859 - Flash converter differential reference ladder adjustment with stable common mode voltage: An adjustment circuit for use with a resistive reference ladder that establishes nominal reference steps and a common mode voltage for a plurality of comparators, such as used in a flash converter. An “H” arrangement of current sources injects current at a first node, VH, and sinks at a second... Agent: Hamilton, Brook, Smith & Reynolds, P.C.
20090146861 - Multifunctional remote control unit: A multifunctional remote control unit comprises a main body of remote control unit receiving and having a sheet of mirror equipped in the back of front shell, and front magnetic rim placed in the back peripheral, a spacer placed into make-up products of a comb and powder puff, and rear... Agent: Sinorica, LLC
20090146860 - Remote controller, control method thereof and image processing apparatus having the same: A remote controller of an image processing apparatus includes: a touch screen which displays an input menu; a menu processor which processes the touch screen to display respective input menus corresponding to at least two modes among a control mode of the image processing apparatus, a character input mode and... Agent: Sughrue Mion, PLLC06/04/2009 > patent applications in patent subcategories.
20090140890 - Keyboard: An exemplary keyboard includes a row-and-column scanning matrix and a lock switch. The row-and-column scanning matrix includes a controller including a plurality of input ports and output ports, a plurality of keys electrically connecting the plurality of input ports to the plurality of output ports of the controller via a... Agent: PCe Industry, Inc. Att. Steven Reiss
20090140891 - Light-sensitive keyboard: Certain embodiments of the invention provide a keyboard apparatus that may include an array of keys including a modifier key associated with one or more modifiable keys. Each modifiable key may include a main label and a secondary label. The secondary label may represent a function accessible by activating the... Agent: Ibm Corp. (austin)
20090140894 - Adaptive entropy coding compression output formats: The performance (compression ratio) of an entropy coding compressor can be improved by separating its output into two streams: encoded output symbols compressed according to a probability model, and literal symbols that were not present in the probability model when the corresponding input symbol was to be encoded. The literal... Agent: Red Hat/bstz Blakely Sokoloff Taylor & Zafman LLP
20090140893 - Compression ratio of adaptive compression algorithms: The performance (compression ratio) of an entropy coding compressor can be improved by separating its output into two streams: encoded output symbols compressed according to a probability model, and literal symbols that were not present in the probability model when the corresponding input symbol was to be encoded. The literal... Agent: Red Hat/bstz Blakely Sokoloff Taylor & Zafman LLP
20090140892 - String reconstruction using multiple strings: Disclosed are systems and methods for reconstructing a string comprising characters given multiple strings that may contain one or more errors. In embodiments, pairwise comparisons of strings within a set of candidate strings that may contain errors is performed so that measures related to similarity between the strings in each... Agent: Epson Research And Development Inc Intellectual Property Dept
20090140895 - Generating dynamic huffman codes: A method for generating Huffman trees using an insertion sorter and encode register is disclosed.... Agent: Lee & Hayes, PLLC
20090140896 - Clock dithering process for reducing electromagnetic interference in d/a converters and apparatus for carrying out such process: A process and apparatus for generating an output signal whose frequency varies according to a modulation scheme, the process including the steps of providing a dither generator for receiving a first input signal representative of a clock frequency and for generating, according to the modulation scheme, a dithered output signal... Agent: Seed Intellectual Property Law Group PLLC
20090140897 - Gain matching method and system for single bit gain ranging analog-to-digital converter: A gain matching method for a single bit gain ranging analog to digital converter including selecting, in response to a gain setting, a number of gain elements to be enabled in a multi-element gain controlled array interconnected between an analog input and an analog to digital converter, and patterning the... Agent: Iandiorio & Teska Intellectual Property Law Attorneys
20090140899 - Double sampling dac and integrator: This disclosure relates to systems and methods for analog to digital conversion using delta sigma modulation. To this end, the delta sigma modulator includes a double sampling DAC and integrator and a 1-bit comparator, with reference loading insensitivity.... Agent: Lee & Hayes, PLLC
20090140898 - Jitter insensitive single bit digital to analog converter: Systems and methods for a jitter insensitive 1-bit digital to analog converter (DAC) are described. The jitter insensitive 1-bit DAC employed in the feedback loop of a delta sigma analog to digital converter (ADC) converts a 1-bit digital data into the corresponding analog output.... Agent: Lee & Hayes, PLLC
20090140900 - Sensor interface devices and amplifiers: Disclosed are a sensor interface device and an amplifier used in a sensor system. The sensor interface device in one implementation has a first chopper configured to shift input signals of the sensor system from a baseband frequency to a first frequency, an instrumentation amplifier configured to amplify the shifted... Agent: Seed Intellectual Property Law Group PLLC
20090140902 - Digital-analog converter and camera module having the same: Disclosed are a digital-analog converter and a camera module having the same. The digital-analog converter includes a plurality of decoders for receiving bits of a digital input signal by dividing the bits in a predetermined bit unit except for lower bits of the digital input signal, and decoding the bits... Agent: Saliwanchik Lloyd & Saliwanchik A Professional Association
20090140901 - Risa controller for an rf integrated circuit (rfic) having improved execution speed: An RFIC controller configured for executing multiple tasks. A serial interface is included having a serial bus for receiving a data stream having control bits and data bits. One or more registers are coupled to the serial bus for storing the control bits and data bits as they are received.... Agent: Ratnerprestia
20090140903 - Digital to analogue converters: In a digital to analogue converter, a plurality of digital inputs are used to select one of first and second binary voltage levels as binary inputs (10) to the converter. A capacitor circuit (C, 2C, . . . , 32C) is associated with each input, and these are controlled to... Agent: Fish & Richardson PC
20090140904 - Increasing the dynamic range of pulse width modulation in analog to digital converters: This disclosure relates to adjusting a limit cycle frequency of a pulse width modulation in an analog to digital converter as a function of an input signal level to increase dynamic range.... Agent: Lee & Hayes, PLLC
20090140905 - System and method for controlling services in a home environment: A system and method is provided for assigning services to users of a home entertainment system environment, wherein the home entertainment system environment includes a computing system (102) comprised of a centralized computing device (100) configured to coordinate the lifecycle of a plurality of services (12-24). Access to said computing... Agent: Philips Intellectual Property & StandardsPrevious industry: Communications: electrical
Next industry: Communications: directive radio wave systems and devices (e.g., radar, radio navigation)
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