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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 [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]
H04M 1/02
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Constructional features of telephone sets
H04M 1/03
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. . Constructional features of telephone transmitters or receivers, e.g. telephone hand-sets [2]
H04M 1/04
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. . Supports for telephone transmitters or receivers
H04M 1/05
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. . . specially adapted for use on head, throat or breast
H04M 1/06
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. . . HooksCradles
H04M 1/08
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. . . . associated with switches operated by the weight of the receiver or hand-set
H04M 1/10
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. . . . associated with switches operated by magnetic effect due to proximity of receiver or hand-set
H04M 1/11
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. . Supports for sets, e.g. incorporating armrests
H04M 1/12
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. . . Adjustable supports, e.g. extensible
H04M 1/13
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. . . . pantographic
H04M 1/14
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. . . with resilient means to eliminate extraneous vibrations
H04M 1/15
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. . Protecting or guiding telephone cords [5]
H04M 1/17
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. . Hygienic or sanitary devices on telephone equipment (for mouthpieces or earpieces H04R 1/12) [2]
H04M 1/18
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. . Telephone sets specially adapted for use in ships, mines, or other places exposed to adverse environment (H04M 1/19 takes precedence)
H04M 1/19
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. . Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmissionMouthpieces or receivers specially adapted therefor (circuit arrangements for preventing eavesdropping H04M 1/68; telephone cabinets E04H 1/14)
H04M 1/20
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. . Arrangements for preventing acoustic feedback (H04M 1/62 takes precedence)
H04M 1/21
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. . Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
H04M 1/215
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. . . by non-intrusive coupling means, e.g. acoustic couplers [7]
H04M 1/22
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. . IlluminationArrangements for improving the visibility of characters on dials
H04M 1/23
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. . Construction or mounting of dials or of equivalent devicesMeans for facilitating the use thereof (by improving visibility H04M 1/22)
H04M 1/24
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Arrangements for testing
H04M 1/247
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Telephone sets including user guidance or feature selection means facilitating their use [7]
H04M 1/253
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Telephone sets using digital voice transmission [7]
H04M 1/26
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Devices for calling a subscriber (H04M 1/66 takes precedence) [1, 7]
H04M 1/27
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. . Devices whereby a plurality of signals may be stored simultaneously [2]
H04M 1/272
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. . . with provision for storing only one subscriber number at a time, e.g. by keyboard or dial [2]
H04M 1/274
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. . . with provision for storing more than one subscriber number at a time [2]
H04M 1/2745
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. . . . using static electronic memories, i.e. memories whose operation does not require relative movement between storage means and a transducer, e.g. chips [7]
H04M 1/275
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. . . . . implemented by means of portable electronic directories [7]
H04M 1/2755
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. . . . . whose contents are provided by optical scanning [7]
H04M 1/276
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. . . . using magnetic recording, e.g. on tape [2]
H04M 1/278
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. . . . using punched cards or tapes [2]
H04M 1/30
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. . Devices which can set up and transmit only one digit at a time
H04M 1/31
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. . . by interrupting current to generate trains of pulsesby periodically opening and closing contacts to generate trains of pulses [2]
H04M 1/315
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. . . . Clutches, spring assemblies, speed regulators, e.g. centrifugal brakes (H04M 1/32-H04M 1/40 take precedence) [3]
H04M 1/32
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. . . . Locking setting devices during transmission to prevent interference by user
H04M 1/34
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. . . . Lost-motion or other arrangements for ensuring a pause between successive digit transmissions
H04M 1/38
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. . . . Pulses transmitted by a movement variably limited by the setting of a stop
H04M 1/40
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. . . . wherein the setting-operation short-circuits or open-circuits the transmitting mechanism during a variable part of a cycle
H04M 1/50
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. . . by generating or selecting currents of predetermined frequencies or combinations of frequencies [2]
H04M 1/515
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. . by generating or selecting signals other than trains of pulses of similar shape, or signals other than currents of one or more different frequencies, e.g. generation of dc signals of alternating polarity, coded pulses or impedance dialling [2]
H04M 1/52
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. . Arrangements wherein a dial or the like is mechanically coupled to a line selector
H04M 1/53
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. . Generation of additional signals, e.g. additional pulses [2]
H04M 1/54
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. . . Arrangements wherein a dial or the like generates identifying signals, e.g. in party-line systems [2]
H04M 1/56
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Arrangements for indicating or recording the called number at the calling subscriber's set
H04M 1/57
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Arrangements for indicating or recording the number of the calling subscriber at the called subscriber's set (at the operator set in a manual exchange H04M 5/20) [2]
H04M 1/58
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Anti-side-tone circuits
H04M 1/60
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including speech amplifiers
H04M 1/62
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. . Constructional arrangements
H04M 1/64
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Automatic arrangements for answering callsAutomatic arrangements for recording messages for absent subscribersArrangements for recording conversations (centralised dictation systems H04M 11/10) [1, 7]
H04M 1/65
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. . Recording arrangements [2, 7]
H04M 1/652
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. . . Means for playing back the recorded messages by remote control over a telephone line (H04M 1/658 takes precedence) [7]
H04M 1/654
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. . . Telephone line monitoring circuits therefor, e.g. ring detectors [7]
H04M 1/656
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. . . for recording conversations [7]
H04M 1/658
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. . . Means for redirecting recorded messages to other extensions or equipment [7]
H04M 1/66
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with means for preventing unauthorised or fraudulent calling (verifying user identity or authority in secret or secure digital communications H04L 9/32) [1, 7]
H04M 1/663
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. . Preventing unauthorised calls to a telephone set [7]
H04M 1/665
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. . . by checking the validity of a code [7]
H04M 1/667
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. . Preventing unauthorised calls from a telephone set (H04M 1/677 takes precedence) [7]
H04M 1/67
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. . . by electronic means [7]
H04M 1/673
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. . . . the user being required to key in a code [7]
H04M 1/675
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. . . . the user being required to insert a coded card, e.g. a smart card carrying an integrated circuit chip [7]
H04M 1/677
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. . Preventing the dialling or sending of predetermined telephone numbers or selected types of telephone numbers, e.g. long distance numbers [7]
H04M 1/68
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Circuit arrangements for preventing eavesdropping
H04M 1/70
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. . Lock-out or secrecy arrangements in party-line systems
H04M 1/72
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Substation extension arrangementsCordless telephones, i.e. devices for establishing wireless links to base stations without route selecting [1, 7]
H04M 1/723
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. . using two or more extensions per line (H04M 1/725 takes precedence) [7]
H04M 1/725
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. . Cordless telephones [7]
H04M 1/727
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. . . Identification code transfer arrangements [7]
H04M 1/73
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. . . Battery saving arrangements [7]
H04M 1/733
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. . . with a plurality of base stations connected to a plurality of lines [7]
H04M 1/737
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. . . characterised by transmission of electromagnetic waves other than radio waves, e.g. infra-red waves [7]
H04M 1/738
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Interface circuits for coupling substations to external telephone lines (H04M 1/78 takes precedence) [7]
H04M 1/74
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. . with means for reducing interferencewith means for reducing effects due to line faults
H04M 1/76
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. . Compensating for differences in line impedance
H04M 1/78
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Circuit arrangements in which low-frequency speech signals proceed in one direction on the line, while speech signals proceeding in the other direction on the line are modulated on a high-frequency carrier signal [2]
H04M 1/80
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Telephone line holding circuits [7]
H04M 1/82
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Line monitoring circuits for call progress or status discrimination [7]
H04M 3/00
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Automatic or semi-automatic exchanges
H04M 5/00
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Manual exchanges (substation equipment in general H04M 1/00)
H04M 7/00
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Arrangements for interconnection between switching centres
H04M 9/00
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Arrangements for interconnection not involving centralised switching
H04M 11/00
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Telephonic communication systems specially adapted for combination with other electrical systems
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)
H04M 15/00
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Arrangements for metering, time-control or time-indication
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]
H04M 19/00
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Current supply arrangements for telephone systems (for selecting equipment H04Q 1/28)
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 (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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