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Symbol Select IPC entry Title
A
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HUMAN NECESSITIES
B
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PERFORMING OPERATIONSTRANSPORTING
C
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CHEMISTRYMETALLURGY
D
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TEXTILESPAPER
E
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FIXED CONSTRUCTIONS
F
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MECHANICAL ENGINEERINGLIGHTINGHEATINGWEAPONSBLASTING
G
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PHYSICS
H
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ELECTRICITY
H01
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ELECTRIC ELEMENTS
H02
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GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
H03
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ELECTRONIC CIRCUITRY
H04
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ELECTRIC COMMUNICATION TECHNIQUE
H04B
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TRANSMISSION [4]
H04H
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BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N)
H04H 20/00
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Arrangements for broadcast or for distribution combined with broadcast [2008.01]
H04H 20/02
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Arrangements for relaying broadcast information [2008.01]
H04H 20/04
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. . from field pickup units [FPU] [2008.01]
H04H 20/06
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. . among broadcast stations [2008.01]
H04H 20/08
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. . among terminal devices [2008.01]
H04H 20/10
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Arrangements for replacing or switching information during the broadcast or during the distribution [2008.01]
H04H 20/12
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Arrangements for monitoring, testing or troubleshooting [2008.01]
H04H 20/14
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. . for monitoring programmes [2008.01]
H04H 20/16
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Arrangements for broadcast or distribution of identical information repeatedly [2008.01]
H04H 20/18
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Arrangements for synchronising broadcast or distribution via plural systems [2008.01]
H04H 20/20
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Arrangements for broadcast or distribution of identical information via plural systems [2008.01]
H04H 20/22
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. . Arrangements for broadcast of identical information via plural broadcast systems [2008.01]
H04H 20/24
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. . Arrangements for distribution of identical information via broadcast system and non-broadcast system [2008.01]
H04H 20/26
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Arrangements for switching distribution systems [2008.01]
H04H 20/28
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Arrangements for simultaneous broadcast of plural pieces of information [2008.01]
H04H 20/30
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. . by a single channel [2008.01]
H04H 20/31
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. . . using in-band signals, e.g. subsonic or cue signal [2008.01]
H04H 20/33
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. . by plural channels [2008.01]
H04H 20/34
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. . . using an out-of-band subcarrier signal [2008.01]
H04H 20/36
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. . for AM broadcasts [2008.01]
H04H 20/38
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Arrangements for distribution where lower stations, e.g. receivers, interact with the broadcast [2008.01]
H04H 20/40
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Arrangements for broadcast specially adapted for accumulation-type receivers [2008.01]
H04H 20/42
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Arrangements for resource management [2008.01]
H04H 20/44
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Arrangements characterised by circuits or components specially adapted for broadcast [2008.01]
H04H 20/46
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. . specially adapted for broadcast systems covered by groups H04H 20/53-H04H 20/86 [2008.01]
H04H 20/47
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. . . specially adapted for stereophonic broadcast systems [2008.01]
H04H 20/48
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. . . . for FM stereophonic broadcast systems [2008.01]
H04H 20/49
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. . . . for AM stereophonic broadcast systems [2008.01]
H04H 20/51
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. . . specially adapted for satellite broadcast systems [2008.01]
H04H 20/53
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Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers [2008.01]
H04H 20/55
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. . for traffic information [2008.01]
H04H 20/57
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. . for mobile receivers [2008.01]
H04H 20/59
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. . for emergency or urgency [2008.01]
H04H 20/61
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. . for local area broadcast, e.g. instore broadcast [2008.01]
H04H 20/62
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. . . for transportation systems, e.g. in vehicles [2008.01]
H04H 20/63
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. . . to plural spots in a confined site, e.g. MATV [Master Antenna Television] [2008.01]
H04H 20/65
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Arrangements characterised by transmission systems for broadcast [2008.01]
H04H 20/67
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. . Common-wave systems, i.e. using separate transmitters operating on substantially the same frequency [2008.01]
H04H 20/69
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. . Optical systems [2008.01]
H04H 20/71
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. . Wireless systems [2008.01]
H04H 20/72
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. . . of terrestrial networks [2008.01]
H04H 20/74
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. . . of satellite networks [2008.01]
H04H 20/76
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. . Wired systems [2008.01]
H04H 20/77
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. . . using carrier waves [2008.01]
H04H 20/78
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. . . . CATV [Community Antenna Television] systems [2008.01]
H04H 20/79
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. . . . . using downlink of the CATV systems, e.g. audio broadcast via CATV network [2008.01]
H04H 20/80
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. . . . having frequencies in two or more frequency bands, e.g. medium wave and VHF [2008.01]
H04H 20/81
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. . . . combined with telephone network over which the broadcast is continuously available [2008.01]
H04H 20/82
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. . . using signals not modulated onto a carrier [2008.01]
H04H 20/83
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. . . . not sharing the network with any other service [2008.01]
H04H 20/84
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. . . combined with power distribution network [2008.01]
H04H 20/86
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Arrangements characterised by special technical features of the broadcast information, e.g. signal form or information format [2008.01]
H04H 20/88
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. . Stereophonic broadcast systems [2008.01]
H04H 20/89
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. . . using three or more audio channels, e.g. triphonic or quadraphonic [2008.01]
H04H 20/91
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. . broadcasting computer programmes [2008.01]
H04H 20/93
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. . which locates resources of other pieces of information, e.g. URL [Uniform Resource Locator] [2008.01]
H04H 20/95
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. . characterised by a specific format, e.g. an encoded audio stream [2008.01]
H04H 40/00
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Arrangements specially adapted for receiving broadcast information [2008.01]
H04H 60/00
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Arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-timeBroadcast-related systems [2008.01]
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 (producing sounds with frequency not determined by supply frequency G10K) [6]
H04S
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STEREOPHONIC SYSTEMS [3]
H04W
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WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M 1/72) [2009.01]
H05
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ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
H10
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SEMICONDUCTOR DEVICESELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR [2023.01]
H99
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SUBJECT MATTER NOT OTHERWISE PROVIDED FOR IN THIS SECTION [2006.01]

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