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electricity (1121712) 1121712
generation (622926) 622926
conversion or distribution of electric power (622901) 622901
physics (564894) 564894
control or regulation of electric motors, electric generatorsor dynamo-electric converters (431996) 431996
controlling transformers, reactors or choke coils (431996) 431996
optics (370414) 370414
non-linear optics (360278) 360278
devices or arrangements, the optical operation of which ismodified by changing the optical properties of the medium of thedevices or arrangements for the control of the intensity,colour, phase, polarisation or direction of light, e.g.switching, gating, modulating or demodulating (360276) 360276
frequency-changing (360276) 360276
optical analogue/digital converters (360276) 360276
optical logic elements (360276) 360276
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basic electric elements (294668) 294668
electric communication technique (219075) 219075
semiconductor devices (190963) 190963
electric solid state devices not otherwise provided for (189615) 189615
apparatus for conversion between ac and ac, between ac and dc,or between dc and dc, and for use with mains or similar powersupply systems (181490) 181490
control or regulation thereof (181490) 181490
conversion of dc or ac input power into surge outputpower (181490) 181490
transporting (143784) 143784
performing operations (143779) 143779
pictorial communication, e.g. television (117794) 117794
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cryptography (107611) 107611
display (107604) 107604
advertising (107526) 107526
seals (107525) 107525
general tagging of cross-sectional technologies spanning over several sections of the ipc (93367) 93367
general tagging of new technological developments (93367) 93367
technical subjects covered by former uspc cross-reference art collections [xracs] and digests (93367) 93367
counting (93152) 93152
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testing (84168) 84168
circuit arrangements or systems for supplying or distributingelectric power (82705) 82705
systems for storing electric energy (82705) 82705
measuring (82642) 82642
technology (81029) 81029
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lighting (80341) 80341
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optical elements, systems, or apparatus (74018) 74018
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vehicles in general (66729) 66729
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arrangements or circuits for control of indicating devicesusing static means to present variable information (60516) 60516
signs (56449) 56449
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labels or name-plates (56447) 56447
dynamo-electric machines (52220) 52220
measuring electric variables (51781) 51781
measuring magnetic variables (51781) 51781
basic electronic circuitry (51274) 51274
electric equipment or propulsion of electrically-propelledvehicles (48767) 48767
electrodynamic brake systems for vehicles, in general (48767) 48767
magnetic suspension or levitation for vehicles (48767) 48767
electric heating (47318) 47318
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exact sciences and technology (26053) 26053
electric current converters (25268) 25268
accessories therefor (24412) 24412
apparatus or arrangements employing analogous techniques usingwaves other than optical waves (24058) 24058
apparatus or arrangements for taking photographs or forprojecting or viewing them (24058) 24058
climate change mitigation technologies related totransportation (24009) 24009
applied sciences (23710) 23710
control or regulating systems in general (23430) 23430
functional elements of such systems (23430) 23430
monitoring or testing arrangements for such systems orelements (23430) 23430
systems for regulating electric or magnetic variables (23411) 23411
electric potential (22428) 22428
electronics (21483) 21483
voltage (20807) 20807
climate change mitigation technologies related to buildings,e.g. housing, house appliances or related end-userapplications (20302) 20302
electric discharge tubes or discharge lamps (20098) 20098
information storage (19515) 19515
systems for controlling or regulating non-electric variables (19450) 19450
converters (19416) 19416
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eJournal
eJournal