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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 (transmission systems for measured values, control or similar signals G08C; speech analysis or synthesis G10L; coding, decoding or code conversion, in general H03M; broadcast communication H04H; multiplex systems H04J; secret communication H04K; transmission of digital information H04L; wireless communication networks H04W) [4]
H04H
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BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N)
H04J
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MULTIPLEX COMMUNICATION (transmission in general H04B; 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; stereophonic systems H04S)
H04K
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SECRET COMMUNICATIONJAMMING OF COMMUNICATION
H04L
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TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (typewriters B41J; order telegraphs, fire or police telegraphs G08B; visual telegraphy G08B, G08C; teleautographic systems G08C; ciphering or deciphering apparatus per seG09C; coding, decoding or code conversion, in general H03M; arrangements common to telegraphic and telephonic communication H04M; selecting H04Q; wireless communication networks H04W) [4]
H04L 1/00
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Arrangements for detecting or preventing errors in the information received (correcting synchronisation H04L 7/00; arrangements in the transmission path H04B)
H04L 5/00
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Arrangements affording multiple use of the transmission path (multiplex communication in general H04J)
H04L 7/00
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Arrangements for synchronising receiver with transmitter
H04L 9/00
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Arrangements for secret or secure communication (spread spectrum techniques in general H04B 1/69)
H04L 12/00
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Data switching networks (interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units G06F 13/00) [5]
H04L 12/02
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Details [5]
H04L 12/04
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. . Switchboards [5]
H04L 12/06
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. . Answer-back mechanisms or circuits [5]
H04L 12/08
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. . Allotting numbers to messagesCounting characters, words or messages [5]
H04L 12/10
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. . Current supply arrangements [5]
H04L 12/12
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. . Arrangements for remote connection or disconnection of substations or of equipment thereof [5]
H04L 12/14
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. . Charging arrangements [5]
H04L 12/16
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. . Arrangements for providing special services to substations [5]
H04L 12/18
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. . . for broadcast or conference [5]
H04L 12/20
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. . . for converting transmission speed from the inherent speed of a substation to the inherent speed of other substations [5]
H04L 12/22
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. . Arrangements for preventing the taking of data from a data transmission channel without authorisation (means for verifying the identity or the authority of a user of a secure or secret communication system H04L 9/32) [5]
H04L 12/24
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. . Arrangements for maintenance or administration [5]
H04L 12/26
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. . Monitoring arrangementsTesting arrangements [5]
H04L 12/28
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characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks] (wireless communication networks H04W) [5, 6]
H04L 12/40
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. . Bus networks [5, 6]
H04L 12/403
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. . . with centralised control, e.g. polling [6]
H04L 12/407
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. . . with decentralised control [6]
H04L 12/413
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. . . . with random access, e.g. carrier-sense multiple-access with collision detection (CSMA-CD) [6]
H04L 12/417
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. . . . with deterministic access, e.g. token passing [6]
H04L 12/42
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. . Loop networks [5, 6]
H04L 12/423
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. . . with centralised control, e.g. polling [6]
H04L 12/427
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. . . with decentralised control [6]
H04L 12/43
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. . . . with synchronous transmission, e.g. time division multiplex (TDM), slotted rings [6]
H04L 12/433
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. . . . with asynchronous transmission, e.g. token ring, register insertion [6]
H04L 12/437
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. . . Ring fault isolation or reconfiguration [6]
H04L 12/44
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. . Star or tree networks [5, 6]
H04L 12/46
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. . Interconnection of networks [5, 6]
H04L 12/50
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Circuit switching systems, i.e. systems in which the path is physically permanent during the communication [5, 6]
H04L 12/52
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. . using time division techniques (in digital transmission systems H04L 5/22) [5, 6]
H04L 12/54
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Stored and forward switching systems [5, 6]
H04L 12/56
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. . Packet switching systems [5, 6]
H04L 12/58
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. . Message switching systems (permutation- code selecting H04Q 3/02) [5, 6]
H04L 12/60
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. . . Manual relay systems, e.g. push-button switching [5, 6]
H04L 12/62
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. . . . with perforated tape storage [5, 6]
H04L 12/64
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Hybrid switching systems [5, 6]
H04L 12/66
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Arrangements for connecting between networks having differing types of switching systems, e.g. gateways [5, 6]
H04L 13/00
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Details of the apparatus or circuits covered by groups H04L 15/00 or H04L 17/00
H04L 15/00
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Apparatus or local circuits for transmitting or receiving dot-and-dash codes, e.g. Morse code (teaching apparatus therefor G09B; keyboard switches in general H01H 13/70, H03K 17/94; telegraph tapping keys H01H 21/86; coding in connection with keyboards or like devices, in general H03M 11/00)
H04L 17/00
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Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code (keyboard switches in general H01H 13/70, H03K 17/94; coding in connection with keyboards or like devices, in general H03M 11/00)
H04L 19/00
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Apparatus or local circuits for step-by-step systems
H04L 21/00
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Apparatus or local circuits for mosaic printer telegraph systems
H04L 23/00
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Apparatus or local circuits for systems other than those covered by groups H04L 15/00-H04L 21/00
H04L 25/00
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Baseband systems
H04L 27/00
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Modulated-carrier systems
H04L 29/00
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Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L 1/00-H04L 27/00 (interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units G06F 13/00) [5]
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 (measuring, testing G01; systems for autographic writing, e.g. writing telegraphy, which involve following an outline G08; information storage based on relative movement between record carrier and transducer G11B; coding, decoding or code conversion, in general H03M; broadcast distribution or the recording of use made thereof H04H) [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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