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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
H03B
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GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNERGENERATION OF NOISE BY SUCH CIRCUITS (measuring, testing G01R; generators adapted for electrophonic musical instruments G10H; speech synthesis G10L 13/00; masers, lasers H01S; dynamo-electric machines H02K; power inverter circuits H02M; by using pulse techniques H03K; automatic control of generators H03L; starting, synchronisation or stabilisation of generators where the type of generator is irrelevant or unspecified H03L; generation of oscillations in plasma H05H)
H03C
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MODULATION (measuring, testing G01R; masers, lasers H01S; modulators specially adapted for use in dc amplifiers H03F 3/38; modulating pulses H03K 7/00; so-called modulators capable only of switching between predetermined states of amplitude, frequency or phase H03K 17/00, H04L; coding, decoding or code conversion, in general H03M; synchronous modulators specially adapted for colour television H04N 9/65)
H03D
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DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER (masers, lasers H01S; circuits capable of acting both as modulator and demodulator H03C, e.g. balanced modulators H03C 1/54; details applicable to both modulators and frequency-changers H03C; demodulating pulses which have been modulated with a continuously-variable signal H03K 9/00; transforming types of pulse modulation H03K 11/00; relay systems, e.g. repeater stations H04B 7/14; demodulators adapted for digitally modulated-carrier systems H04L 27/00; synchronous demodulators adapted for colour television H04N 9/66)
H03F
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AMPLIFIERS (measuring, testing G01R; optical parametric amplifiers G02F; circuit arrangements with secondary emission tubes H01J 43/30; masers, lasers H01S; dynamo-electric amplifiers H02K; control of amplification H03G; coupling arrangements independent of the nature of the amplifier, voltage dividers H03H; amplifiers capable only of dealing with pulses H03K; repeater circuits in transmission lines H04B 3/36, H04B 3/58; application of speech amplifiers in telephonic communication H04M 1/60, H04M 3/40)
H03G
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CONTROL OF AMPLIFICATION (impedance networks, e.g. attenuators, H03H; control of transmission in lines H04B 3/04)
H03H
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IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITSRESONATORS (measuring, testing G01R; arrangements for producing a reverberation or echo sound G10K 15/08; impedance networks or resonators consisting of distributed impedances, e.g. of the waveguide type, H01P; control of amplification, e.g. bandwidth control of amplifiers, H03G; tuning resonant circuits, e.g. tuning coupled resonant circuits, H03J; networks for modifying the frequency characteristics of communication systems H04B)
H03J
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TUNING RESONANT CIRCUITSSELECTING RESONANT CIRCUITS (indicating arrangements for measuring G01D; measuring, testing G01R; remote-control in general G05, G08; automatic control or stabilisation of generators H03L)
H03K
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PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C;  transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D 3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) [4]
H03K 3/00
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Circuits for generating electric pulsesMonostable, bistable or multistable circuits (H03K 4/00 takes precedence; for digital function generators in computers G06F 1/02) [5]
H03K 4/00
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Generating pulses having essentially a finite slope or stepped portions
H03K 5/00
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Manipulating pulses not covered by one of the other main groups in this subclass (circuits with regenerative action H03K 3/00, H03K 4/00; by the use of non-linear magnetic or dielectric devices H03K 3/45)
H03K 6/00
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Manipulating pulses having a finite slope and not covered by one of the other main groups of this subclass (circuits with regenerative action H03K 4/00)
H03K 7/00
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Modulating pulses with a continuously-variable modulating signal
H03K 9/00
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Demodulating pulses which have been modulated with a continuously-variable signal
H03K 11/00
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Transforming types of modulation, e.g. position-modulated pulses into duration-modulated pulses
H03K 12/00
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Producing pulses by distorting or combining sinusoidal waveforms (shaping pulses H03K 5/01; combining sinewaves using elements operating in a non-switching manner H03B 21/00) [3]
H03K 17/00
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Electronic switching or gating, i.e. not by contact-making and -breaking (gated amplifiers H03F 3/72; switching arrangements for exchange systems using static devices H04Q 3/52)
H03K 19/00
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Logic circuits, i.e. having at least two inputs acting on one output (circuits for computer systems using fuzzy logic G06N 7/02)Inverting circuits
H03K 19/003
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Modifications for increasing the reliability [3]
H03K 19/007
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Fail-safe circuits [3]
H03K 19/01
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Modifications for accelerating switching [3]
H03K 19/013
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. . in bipolar transistor circuits [3]
H03K 19/017
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. . in field-effect transistor circuits [3]
H03K 19/0175
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Coupling arrangementsInterface arrangements (interface arrangements for digital computers G06F 3/00, G06F 13/00) [5]
H03K 19/018
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. . using bipolar transistors only [5]
H03K 19/0185
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. . using field-effect transistors only [5]
H03K 19/02
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using specified components (H03K 19/003-H03K 19/0175 take precedence) [3, 5]
H03K 19/04
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. . using gas-filled tubes
H03K 19/06
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. . using vacuum tubes (using diode rectifiers H03K 19/12)
H03K 19/08
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. . using semiconductor devices (H03K 19/173 takes precedence; wherein the semiconductor devices are only diode rectifiers H03K 19/12) [3]
H03K 19/082
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. . . using bipolar transistors [3]
H03K 19/084
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. . . . Diode–transistor logic [3]
H03K 19/086
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. . . . Emitter coupled logic [3]
H03K 19/088
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. . . . Transistor–transistor logic [3]
H03K 19/09
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. . . . Resistor–transistor logic [3]
H03K 19/091
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. . . . Integrated injection logic or merged transistor logic [3]
H03K 19/094
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. . . using field-effect transistors [3]
H03K 19/0944
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. . . . using MOSFET (H03K 19/096 takes precedence) [5]
H03K 19/0948
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. . . . . using CMOS [5]
H03K 19/0952
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. . . . using Schottky type FET (H03K 19/096 takes precedence) [5]
H03K 19/0956
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. . . . Schottky diode FET logic (H03K 19/096 takes precedence) [5]
H03K 19/096
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. . . . Synchronous circuits, i.e. using clock signals [3]
H03K 19/098
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. . . using thyristors [3]
H03K 19/10
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. . . using tunnel diodes [3]
H03K 19/12
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. . using diode rectifiers
H03K 19/14
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. . using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled (optical logic elements G02F 3/00)
H03K 19/16
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. . using saturable magnetic devices
H03K 19/162
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. . . using parametrons
H03K 19/164
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. . . using ferro-resonant devices
H03K 19/166
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. . . using transfluxors
H03K 19/168
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. . . using thin-film devices
H03K 19/17
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. . using twistors
H03K 19/173
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. . using elementary logic circuits as components [3]
H03K 19/177
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. . . arranged in matrix form [3]
H03K 19/18
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. . using galvano-magnetic devices, e.g. Hall-effect devices [2]
H03K 19/185
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. . using dielectric elements with variable dielectric constant, e.g. ferro-electric capacitors [2]
H03K 19/19
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. . . using ferro-resonant devices [2]
H03K 19/195
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. . using superconductive devices [2, 3]
H03K 19/20
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characterised by logic function, e.g. AND, OR, NOR, NOT circuits (H03K 19/003-H03K 19/01 take precedence)
H03K 19/21
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. . EXCLUSIVE-OR circuits, i.e. giving output if input signal exists at only one inputCOINCIDENCE circuits, i.e. giving output only if all input signals are identical [3]
H03K 19/23
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. . Majority or minority circuits, i.e. giving output having the state of the majority or the minority of the inputs [3]
H03K 21/00
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Details of pulse counters or frequency dividers
H03K 23/00
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Pulse counters comprising counting chainsFrequency dividers comprising counting chains (H03K 29/00 takes precedence)
H03K 25/00
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Pulse counters with step-by-step integration and static storageAnalogous frequency dividers
H03K 27/00
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Pulse counters in which pulses are continuously circulated in a closed loopAnalogous frequency dividers (feedback shift register counters H03K 23/54) [4]
H03K 29/00
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Pulse counters comprising multi-stable elements, e.g. for ternary scale, for decimal scaleAnalogous frequency dividers
H03K 99/00
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Subject matter not provided for in other groups of this subclass [2013.01]
H03L
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AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (of dynamo-electric generators H02P) [3]
H03M
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CODING, DECODING OR CODE CONVERSION, IN GENERAL (using fluidic means F15C 4/00; optical analogue/digital converters G02F 7/00; coding, decoding or code conversion, specially adapted for particular applications, see the relevant subclasses, e.g. G01D, G01R, G06F, G06T, G09G, G10L, G11B, G11C, H04B, H04L, H04M, H04N; ciphering or deciphering for cryptography or other purposes involving the need for secrecy G09C) [4]
H04
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ELECTRIC COMMUNICATION TECHNIQUE
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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