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A
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SECTION A — HUMAN NECESSITIES
B
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SECTION B — PERFORMING OPERATIONSTRANSPORTING
C
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SECTION C — CHEMISTRYMETALLURGY
D
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SECTION D — TEXTILESPAPER
E
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SECTION E — FIXED CONSTRUCTIONS
F
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SECTION F — MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
G
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SECTION G — PHYSICS
H
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SECTION H — ELECTRICITY
H01
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BASIC ELECTRIC ELEMENTS
H02
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GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H03
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BASIC ELECTRONIC CIRCUITRY
H04
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ELECTRIC COMMUNICATION TECHNIQUE
H04B
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TRANSMISSION [4]
H04B 1/00
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Details of transmission systems, not covered by a single one of groups H04B 3/00-H04B 13/00Details of transmission systems not characterised by the medium used for transmission [4]
H04B 3/00
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Line transmission systems (combined with near-field transmission systems H04B 5/00)
H04B 5/00
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Near-field transmission systems, e.g. inductive loop type
H04B 7/00
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Radio transmission systems, i.e. using radiation field (H04B 10/00, H04B 15/00 take precedence)
H04B 10/00
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Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication [5, 2013.01]
H04B 10/02
(transferred to H04B 10/00)
H04B 10/03
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Arrangements for fault recovery [2013.01]
H04B 10/032
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. . using working and protection systems [2013.01]
H04B 10/035
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. . using loopbacks [2013.01]
H04B 10/038
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. . using bypasses [2013.01]
H04B 10/04
(transferred to H04B 10/50)
H04B 10/06
(transferred to H04B 10/60)
H04B 10/07
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Arrangements for monitoring or testing transmission systemsArrangements for fault measurement of transmission systems [2013.01]
H04B 10/071
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. . using a reflected signal, e.g. using optical time-domain reflectometers [OTDRs] [2013.01]
H04B 10/073
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. . using an out-of-service signal (H04B 10/071 takes precedence) [2013.01]
H04B 10/075
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. . using an in-service signal (H04B 10/071 takes precedence) [2013.01]
H04B 10/077
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. . . using a supervisory or additional signal [2013.01]
H04B 10/079
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. . . using measurements of the data signal [2013.01]
H04B 10/08
(transferred to H04B 10/07)
H04B 10/10
(transferred to H04B 10/11)
H04B 10/105
(transferred to H04B 10/118)
H04B 10/11
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Arrangements specific to free-space transmission, i.e. transmission through air or vacuum [2013.01]
H04B 10/112
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. . Line-of-sight transmission over an extended range [2013.01]
H04B 10/114
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. . Indoor or close-range type systems [2013.01]
H04B 10/116
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. . . Visible light communication [2013.01]
H04B 10/118
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. . specially adapted for satellite communication [2013.01]
H04B 10/12
(transferred to H04B 10/25)
H04B 10/13
(transferred to H04B 10/2581)
H04B 10/135
(transferred to H04B 10/25H04B 10/2587)
H04B 10/14
(transferred to H04B 10/40H04B 10/50H04B 10/60)
H04B 10/142
(transferred to H04B 10/40H04B 10/50H04B 10/61)
H04B 10/145
(transferred to H04B 10/50)
H04B 10/148
(transferred to H04B 10/61)
H04B 10/152
(transferred to H04B 10/40H04B 10/50H04B 10/66)
H04B 10/155
(transferred to H04B 10/50)
H04B 10/158
(transferred to H04B 10/66)
H04B 10/16
(transferred to H04B 10/29)
H04B 10/17
(transferred to H04B 10/291)
H04B 10/18
(transferred to H04B 10/2507)
H04B 10/20
(transferred to H04B 10/27)
H04B 10/207
(transferred to H04B 10/272)
H04B 10/213
(transferred to H04B 10/275H04B 10/278)
H04B 10/22
(transferred to H04B 10/25H04B 10/80)
H04B 10/24
(transferred to H04B 10/11H04B 10/25)
H04B 10/25
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Arrangements specific to fibre transmission [2013.01]
H04B 10/2507
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. . for the reduction or elimination of distortion or dispersion [2013.01]
H04B 10/2513
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. . . due to chromatic dispersion [2013.01]
H04B 10/2519
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. . . . using Bragg gratings [2013.01]
H04B 10/2525
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. . . . using dispersion-compensating fibres [2013.01]
H04B 10/2531
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. . . . using spectral inversion [2013.01]
H04B 10/2537
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. . . due to scattering processes, e.g. Raman or Brillouin scattering [2013.01]
H04B 10/2543
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. . . due to fibre non-linearities, e.g. Kerr effect [2013.01]
H04B 10/255
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. . . . Self-phase modulation [SPM] [2013.01]
H04B 10/2557
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. . . . Cross-phase modulation [XPM] [2013.01]
H04B 10/2563
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. . . . Four-wave mixing [FWM] [2013.01]
H04B 10/2569
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. . . due to polarisation mode dispersion [PMD] [2013.01]
H04B 10/2575
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. . Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier [2013.01]
H04B 10/2581
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. . Multimode transmission [2013.01]
H04B 10/2587
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. . using a single light source for multiple stations [2013.01]
H04B 10/26
(transferred to H04B 10/11H04B 10/2587)
H04B 10/27
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Arrangements for networking [2013.01]
H04B 10/272
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. . Star-type networks [2013.01]
H04B 10/275
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. . Ring-type networks [2013.01]
H04B 10/278
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. . Bus-type networks [2013.01]
H04B 10/28
(transferred to H04B 10/43)
H04B 10/29
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Repeaters [2013.01]
H04B 10/291
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. . in which processing or amplification is carried out without conversion of the main signal from optical form [2013.01]
H04B 10/293
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. . . Signal power control [2013.01]
H04B 10/294
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. . . . in a multiwavelength system, e.g. gain equalisation [2013.01]
H04B 10/296
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. . . . . Transient power control, e.g. due to channel add/drop or rapid fluctuations in the input power [2013.01]
H04B 10/297
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. . . Bidirectional amplification [2013.01]
H04B 10/299
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. . . Signal waveform processing, e.g. reshaping or retiming [2013.01]
H04B 10/30
(transferred to H04B 10/80H04B 10/90)
H04B 10/40
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Transceivers [2013.01]
H04B 10/43
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. . using a single component as both light source and receiver, e.g. using a photoemitter as a photoreceiver [2013.01]
H04B 10/50
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Transmitters [2013.01]
H04B 10/508
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. . Pulse generation, e.g. generation of solitons [2013.01]
H04B 10/516
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. . Details of coding or modulation [2013.01]
H04B 10/524
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. . . Pulse modulation [2013.01]
H04B 10/532
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. . . Polarisation modulation [2013.01]
H04B 10/54
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. . . Intensity modulation [2013.01]
H04B 10/548
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. . . Phase or frequency modulation [2013.01]
H04B 10/556
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. . . . Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK] [2013.01]
H04B 10/564
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. . Power control [2013.01]
H04B 10/572
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. . Wavelength control [2013.01]
H04B 10/58
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. . Compensation for non-linear transmitter output [2013.01]
H04B 10/588
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. . . in external modulation systems [2013.01]
H04B 10/60
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Receivers [2013.01]
H04B 10/61
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. . Coherent receivers [2013.01]
H04B 10/63
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. . . Homodyne [2013.01]
H04B 10/64
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. . . Heterodyne [2013.01]
H04B 10/66
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. . Non-coherent receivers, e.g. using direct detection [2013.01]
H04B 10/67
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. . . Optical arrangements in the receiver [2013.01]
H04B 10/69
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. . . Electrical arrangements in the receiver [2013.01]
H04B 10/70
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Photonic quantum communication [2013.01]
H04B 10/80
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Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B 10/03-H04B 10/70, e.g. optical power feeding or optical transmission through water [2013.01]
H04B 10/85
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. . Protection from unauthorised access, e.g. eavesdrop protection [2013.01]
H04B 10/90
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Non-optical transmission systems, e.g. transmission systems employing non-photonic corpuscular radiation [2013.01]
H04B 11/00
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Transmission systems employing ultrasonic, sonic or infrasonic waves
H04B 13/00
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Transmission systems characterised by the medium used for transmission, not provided for in groups H04B 3/00-H04B 11/00
H04B 14/00
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Transmission systems not characterised by the medium used for transmission (details thereof H04B 1/00) [4]
H04B 15/00
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Suppression or limitation of noise or interference (by means associated with receiver H04B 1/10)
H04B 17/00
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MonitoringTesting [2]
H04H
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BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N)
H04J
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MULTIPLEX COMMUNICATION (peculiar to transmission of digital information H04L 5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N 7/08; in exchanges H04Q 11/00)
H04K
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SECRET COMMUNICATIONJAMMING OF COMMUNICATION
H04L
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TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) [4]
H04M
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TELEPHONIC COMMUNICATION (circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08)
H04N
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PICTORIAL COMMUNICATION, e.g. TELEVISION [4]
H04Q
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SELECTING (switches, relays, selectors H01H;  wireless communication networks H04W) [1, 2009.01]
H04R
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LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERSDEAF-AID SETSPUBLIC ADDRESS SYSTEMS (generating mechanical vibrations in general B06B; transducers for measuring particular variables G01; transducers in clocks G04; producing sounds with frequency not determined by supply frequency G10K; transducers in recording or reproducing heads G11B; transducers in motors H02) [6]
H04S
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STEREOPHONIC SYSTEMS (information storage on discs or tapes G11B; broadcast systems for the distribution of stereophonic information H04H 20/88; multiplex systems in general H04J) [3]
H04W
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WIRELESS COMMUNICATION NETWORKS [2009.01]
H05
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ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
H99
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SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]

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