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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) [4]
H04H
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BROADCAST COMMUNICATION (transmission in general H04B; multiplex communication H04J)
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) [4]
H04M
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TELEPHONIC COMMUNICATION (counting mechanisms G06M; circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08; reels or other take-up devices for cords H02G 11/00; multiplex transmission between switching centres H04J; selecting arrangements H04Q; loudspeakers, microphones, gramophone pick-ups or like electromechanical transducers H04R)
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; electronic switches H03K 17/00)
H04Q 1/00
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Details of selecting apparatus or arrangements (details of selector switches H01H 63/00)
H04Q 3/00
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Selecting arrangements (H04Q 5/00-H04Q 11/00 take precedence)
H04Q 3/02
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Circuit arrangements for selectors responsive to a permutation code
H04Q 3/04
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Circuit arrangements for receivers of routing digits
H04Q 3/06
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. . for group or trunk group selectors
H04Q 3/08
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. . for local or long-distance selectors
H04Q 3/10
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. . for PBX selectors, i.e. private branch exchange selectors
H04Q 3/12
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. . for line selectors providing transfer of routing digits
H04Q 3/14
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. . for two-way operation selectors
H04Q 3/16
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. . for marking-switches
H04Q 3/18
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Circuit arrangements for first stage of hunting switching
H04Q 3/20
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. . for preselectors
H04Q 3/22
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. . . comprising common calling and disconnecting circuit
H04Q 3/24
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. . for line finders
H04Q 3/26
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. . . comprising common calling and disconnecting circuit
H04Q 3/28
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. . . comprising main groups and subgroups
H04Q 3/30
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. . Selector finders, i.e. allotters
H04Q 3/32
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Circuit arrangements for second or subsequent stages of hunting switching [2]
H04Q 3/34
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. . for the second preselection stage
H04Q 3/36
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. . for the second line-finder stage
H04Q 3/38
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. . for stages after the group-selector stage
H04Q 3/40
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. . for stages after the line selector, e.g. for extension selector
H04Q 3/42
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Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
H04Q 3/44
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. . using revertive control
H04Q 3/46
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. . using signals other than revertive impulses
H04Q 3/47
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. . using translators
H04Q 3/48
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. . using markers
H04Q 3/49
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. . . for end-to-end marking
H04Q 3/495
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. . . for routing connecting paths
H04Q 3/52
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. . using static devices in switching stages, e.g. electronic switching arrangements [2]
H04Q 3/54
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. . in which the logic circuitry controlling the exchange is centralised
H04Q 3/545
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. . . using a stored programme [4]
H04Q 3/55
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. . . using wired logic circuitry [4]
H04Q 3/555
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. . . . being comprised by electro-magnetic devices [4]
H04Q 3/56
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. . in which the control signals are multiplexed [2]
H04Q 3/58
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Arrangements providing connection between main exchange and sub-exchange or satellite
H04Q 3/60
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. . for connecting to satellites or concentrators which connect one or more exchange lines with a group of local lines
H04Q 3/62
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. . for connecting to private branch exchanges
H04Q 3/64
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Distributing or queuing
H04Q 3/66
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. . Traffic distributors
H04Q 3/68
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. . Grouping or interlacing selector groups or stages
H04Q 3/70
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Identification of class of calling subscriber
H04Q 3/72
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Finding out and indicating number of calling subscriber
H04Q 3/74
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. . Identification of subscriber calling from a party-line
H04Q 3/76
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Translation from the called subscriber's number to the outgoing or incoming control information [4]
H04Q 3/78
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Temporary storage of information of calling or called subscriber (intermediate storage means for telegraphic communication H04L 13/08) [4]
H04Q 5/00
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Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
H04Q 7/00
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Selecting arrangements to which subscribers are connected via radio links or inductive links
H04Q 9/00
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Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
H04Q 11/00
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Selecting arrangements for multiplex systems (multiplex systems H04J)
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 5/00; multiplex systems in general H04J) [3]
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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