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Symbol IPC-Stellen auswählen Titel
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 [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)
H04J 1/00
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Frequency-division multiplex systems (H04J 14/02 takes precedence) [5]
H04J 3/00
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Time-division multiplex systems (H04J 14/08 takes precedence) [4, 5]
H04J 4/00
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Combined time-division and frequency-division multiplex systems (H04J 13/00 takes precedence) [2]
H04J 7/00
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Multiplex systems in which the amplitudes or durations of the signals in individual channels are characteristic of those channels
H04J 9/00
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Multiplex systems in which each channel is represented by a different type of modulation of the carrier
H04J 11/00
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Orthogonal multiplex systems (H04J 13/00 takes precedence) [2]
H04J 13/00
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Code division multiplex systems (for frequency hopping H04B 1/713) [2, 2011.01]
H04J 13/10
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Code generation [2011.01]
H04J 13/12
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. . Generation of orthogonal codes [2011.01]
H04J 13/14
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. . Generation of codes with a zero correlation zone [2011.01]
H04J 13/16
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Code allocation [2011.01]
H04J 13/18
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. . Allocation of orthogonal codes [2011.01]
H04J 13/20
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. . . having an orthogonal variable spreading factor [OVSF] [2011.01]
H04J 13/22
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. . Allocation of codes with a zero correlation zone [2011.01]
H04J 14/00
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Optical multiplex systems [5]
H04J 99/00
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Subject matter not provided for in other groups of this subclass [2009.01]
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 (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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