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Symbol IPC-Stellen auswählen Titel
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)
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]
H04Q 1/00
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Details of selecting apparatus or arrangements [1, 2006.01]
H04Q 3/00
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Selecting arrangements (H04Q 5/00-H04Q 11/00 take precedence) [1, 2006.01]
H04Q 3/02
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Circuit arrangements for selectors responsive to a permutation code [1, 2006.01]
H04Q 3/04
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Circuit arrangements for receivers of routing digits [1, 2006.01]
H04Q 3/06
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. . for group or trunk group selectors [1, 2006.01]
H04Q 3/08
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. . for local or long-distance selectors [1, 2006.01]
H04Q 3/10
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. . for PBX selectors, i.e. private branch exchange selectors [1, 2006.01]
H04Q 3/12
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. . for line selectors providing transfer of routing digits [1, 2006.01]
H04Q 3/14
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. . for two-way operation selectors [1, 2006.01]
H04Q 3/16
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. . for marking-switches [1, 2006.01]
H04Q 3/18
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Circuit arrangements for first stage of hunting switching [1, 2006.01]
H04Q 3/20
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. . for preselectors [1, 2006.01]
H04Q 3/22
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. . . comprising common calling and disconnecting circuit [1, 2006.01]
H04Q 3/24
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. . for line finders [1, 2006.01]
H04Q 3/26
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. . . comprising common calling and disconnecting circuit [1, 2006.01]
H04Q 3/28
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. . . comprising main groups and subgroups [1, 2006.01]
H04Q 3/30
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. . Selector finders, i.e. allotters [1, 2006.01]
H04Q 3/32
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Circuit arrangements for second or subsequent stages of hunting switching [1, 2, 2006.01]
H04Q 3/34
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. . for the second preselection stage [1, 2006.01]
H04Q 3/36
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. . for the second line-finder stage [1, 2006.01]
H04Q 3/38
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. . for stages after the group-selector stage [1, 2006.01]
H04Q 3/40
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. . for stages after the line selector, e.g. for extension selector [1, 2006.01]
H04Q 3/42
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Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker [1, 2006.01]
H04Q 3/44
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. . using revertive control [1, 2006.01]
H04Q 3/46
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. . using signals other than revertive impulses [1, 2006.01]
H04Q 3/47
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. . using translators [1, 2006.01]
H04Q 3/48
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. . using markers [1, 2006.01]
H04Q 3/49
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. . . for end-to-end marking [1, 2006.01]
H04Q 3/495
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. . . for routing connecting paths [1, 2006.01]
H04Q 3/52
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. . using static devices in switching stages, e.g. electronic switching arrangements [2, 2006.01]
H04Q 3/54
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. . in which the logic circuitry controlling the exchange is centralised [1, 2006.01]
H04Q 3/545
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. . . using a stored programme [4, 2006.01]
H04Q 3/55
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. . . using wired logic circuitry [4, 2006.01]
H04Q 3/555
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. . . . being comprised by electro-magnetic devices [4, 2006.01]
H04Q 3/56
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. . in which the control signals are multiplexed [2, 2006.01]
H04Q 3/58
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Arrangements providing connection between main exchange and sub-exchange or satellite [1, 2006.01]
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 [1, 2006.01]
H04Q 3/62
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. . for connecting to private branch exchanges [1, 2006.01]
H04Q 3/64
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Distributing or queuing [1, 2006.01]
H04Q 3/66
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. . Traffic distributors [1, 2006.01]
H04Q 3/68
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. . Grouping or interlacing selector groups or stages [1, 2006.01]
H04Q 3/70
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Identification of class of calling subscriber [1, 2006.01]
H04Q 3/72
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Finding out and indicating number of calling subscriber [1, 2006.01]
H04Q 3/74
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. . Identification of subscriber calling from a party-line [1, 2006.01]
H04Q 3/76
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Translation from the called subscriber's number to the outgoing or incoming control information [4, 2006.01]
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, 2006.01]
H04Q 5/00
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Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange [1, 2006.01]
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 [1, 2006.01]
H04Q 11/00
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Selecting arrangements for multiplex systems (multiplex systems H04J) [1, 2006.01]
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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