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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)
H04M 1/00
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Substation equipment, e.g. for use by subscribers (subscriber services or facilities provided at exchanges H04M 3/00; prepayment telephone coin boxes H04M 17/00; current supply arrangements H04M 19/08) [1, 7, 2006.01]
H04M 3/00
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Automatic or semi-automatic exchanges [1, 2006.01, 2024.01]
H04M 5/00
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Manual exchanges (substation equipment in general H04M 1/00) [1, 2006.01]
H04M 7/00
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Arrangements for interconnection between switching centres [1, 2006.01]
H04M 9/00
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Arrangements for interconnection not involving centralised switching [1, 2006.01]
H04M 9/02
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involving a common line for all parties [1, 2006.01]
H04M 9/04
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involving a separate line for each pair of parties [1, 2006.01]
H04M 9/06
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involving combinations of interconnecting lines [1, 2006.01]
H04M 9/08
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Two-way loud-speaking telephone systems with means for conditioning the signal, e.g.  for suppressing echoes for one or both directions of traffic [1, 2006.01]
H04M 9/10
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. . with switching of direction of transmission by voice frequency [1, 2006.01]
H04M 11/00
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Telephonic communication systems specially adapted for combination with other electrical systems [1, 2006.01]
H04M 13/00
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Party-line systems (substation equipment H04M 1/00; exchange equipment H04M 3/00, H04M 5/00; metering arrangements H04M 15/36) [1, 2006.01]
H04M 15/00
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Arrangements for metering, time-control or time-indication [1, 2006.01, 2024.01]
H04M 17/00
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Prepayment telephone systems (using a coded card to authorise calls from a telephone set H04M 1/675) [1, 7, 2006.01, 2024.01]
H04M 19/00
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Current supply arrangements for telephone systems (for selecting equipment H04Q 1/28) [1, 2006.01]
H04M 99/00
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Subject matter not provided for in other groups of this subclass [2006.01]
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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