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physics (657036) 657036
testing (642854) 642854
measuring (642097) 642097
radio navigation (640571) 640571
radio direction-finding (640393) 640393
analogous arrangements using other waves (640389) 640389
determining distance or velocity by use of radio waves (640389) 640389
locating or presence-detecting by use of the reflection orreradiation of radio waves (640389) 640389
electricity (225645) 225645
electric communication technique (136831) 136831
basic electric elements (91092) 91092
antennas, i.e. radio aerials (77069) 77069
transporting (71912) 71912
performing operations (71910) 71910
counting (70864) 70864
computing (70844) 70844
calculating (70841) 70841
navigation (69740) 69740
surveying (69428) 69428
gyroscopic instruments (69397) 69397
measuring distances, levels or bearings (69397) 69397
photogrammetry or videogrammetry (69397) 69397
signalling (62171) 62171
wireless communications networks (54250) 54250
transmission (52490) 52490
human necessities (51303) 51303
traffic control systems (40481) 40481
hygiene (38930) 38930
medical or veterinary science (38915) 38915
surgery (38471) 38471
diagnosis (37172) 37172
identification (37136) 37136
vehicles in general (36359) 36359
science & technology (35241) 35241
measuring angles (26100) 26100
measuring areas (26100) 26100
measuring irregularities of surfaces or contours (26100) 26100
measuring length, thickness or similar lineardimensions (26100) 26100
handling record carriers (25935) 25935
presentation of data (25935) 25935
recognition of data (25935) 25935
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electric digital data processing (25707) 25707
heating (23862) 23862
weapons (23341) 23341
mechanical engineering (23326) 23326
lighting (23243) 23243
blasting (23154) 23154
pictorial communication, e.g. television (22479) 22479
radio frequency (21657) 21657
controlling (21389) 21389
regulating (21389) 21389
vehicles, vehicle fittings, or vehicle parts, not otherwiseprovided for (20921) 20921
image data processing or generation, in general (20549) 20549
investigating or analysing materials by determining theirchemical or physical properties (20527) 20527
transmission of digital information, e.g. telegraphiccommunication (19963) 19963
optics (19730) 19730
basic electronic circuitry (19396) 19396
alarm systems (19140) 19140
order telegraphs (19125) 19125
signalling or calling systems (19125) 19125
geophysics (19042) 19042
detecting masses or objects (18258) 18258
gravitational measurements (18258) 18258
systems for controlling or regulating non-electric variables (18025) 18025
general tagging of cross-sectional technologies spanning over several sections of the ipc (16713) 16713
general tagging of new technological developments (16713) 16713
technical subjects covered by former uspc cross-reference art collections [xracs] and digests (16713) 16713
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conjoint control of vehicle sub-units of different type ordifferent function (12624) 12624
control systems specially adapted for hybrid vehicles (12624) 12624
road vehicle drive control systems for purposes not related tothe control of a particular sub-unit (12624) 12624
humans (12183) 12183
acoustics not otherwise provided for (11450) 11450
methods or devices for protecting against, or for damping,noise or other acoustic waves in general (11450) 11450
sound-producing devices (11450) 11450
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radio waves (11185) 11185
education (10933) 10933
advertising (10857) 10857
data processing systems or methods, specially adapted foradministrative, commercial, financial, managerial, supervisoryor forecasting purposes (10702) 10702
systems or methods specially adapted for administrative,commercial, financial, managerial, supervisory or forecastingpurposes, not otherwise provided for (10702) 10702
deaf-aid sets (10509) 10509
loudspeakers, microphones, gramophone pick-ups or likeacoustic electromechanical transducers (10509) 10509
public address systems (10509) 10509
cryptography (10475) 10475
seals (10411) 10411
display (10400) 10400
indicating presence, absence, or direction, of movement (10375) 10375
measuring linear or angular speed, acceleration, deceleration,or shock (10375) 10375
aircraft (10204) 10204
aviation (9955) 9955
fixed constructions (9908) 9908
cosmonautics (9801) 9801
engineering, electrical & electronic (9601) 9601
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Online Resources - Online (377) 377
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English (693555) 693555
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eJournal
2006, ISBN 9780719069086
Book
IEEE antennas & propagation magazine, ISSN 1045-9243, 1990
Journal
2013, Updated and revised edition., ISBN 9781623565626, xii, 250
Book
Space science reviews, ISSN 0038-6308, 12/2016, Volume 204, Issue 1, pp. 49 - 82
Journal Article