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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
H01B
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CABLESCONDUCTORSINSULATORSSELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING, OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F 1/00; waveguides H01P; installation of cables or lines, or of combined optical and electric, cables or lines H02G)
H01C
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RESISTORS
H01F
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MAGNETSINDUCTANCESTRANSFORMERSSELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES (ceramics based on ferrites C04B 35/26; alloys C22C; thermomagnetic devices H01L 37/00; loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers H04R) [2]
H01G
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CAPACITORSCAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B 3/00; capacitors with potential-jump or surface barrier H01L 29/00)
H01H
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ELECTRIC SWITCHESRELAYSSELECTORSEMERGENCY PROTECTIVE DEVICES (contact cables H01B 7/10; electrolytic self-interrupters H01G 9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K 17/00)
H01H 1/00
Electric switches
H01H 1/00
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Contacts (liquid contacts H01H 29/04)
H01H 3/00
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Mechanisms for operating contacts (thermal actuating or release means H01H 37/02)
H01H 5/00
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Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
H01H 7/00
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Devices for introducing a predetermined time delay between the initiation of the switching operation and the opening or closing of the contacts (time or time-programme switches H01H 43/00)
H01H 9/00
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Details of switching devices, not covered by groups H01H 1/00-H01H 7/00
H01H 11/00
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Apparatus or processes specially adapted for the manufacture of electric switches (processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards, H01H 13/88) [1, 2006.01]
H01H 13/00
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Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch (wherein the operating part is flexible H01H 17/00)
H01H 15/00
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Switches having rectilinearly-movable operating part or parts adapted for actuation in opposite directions, e.g. slide switch
H01H 17/00
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Switches having flexible operating part adapted only for pulling, e.g. cord, chain
H01H 19/00
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Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand [1, 2006.01]
H01H 21/00
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Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand (tumbler or rocker switches H01H 23/00; switches having an operating part movable angularly in more than one plane H01H 25/04) [1, 2006.01]
H01H 23/00
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Tumbler or rocker switches, i.e. switches characterised by being operated by rocking an operating member in the form of a rocker button
H01H 25/00
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Switches with compound movement of handle or other operating part
H01H 27/00
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Switches operated by a removable member, e.g. key, plug or plateSwitches operated by setting members according to a single predetermined combination out of several possible settings (combined with plug-and-socket connectors H01R 13/70; with current-carrying plug H01R 31/08)
H01H 29/00
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Switches having at least one liquid contact (solid contacts wetted or soaked with mercury H01H 1/08)
H01H 31/00
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Air-break switches for high tension without arc-extinguishing or arc-preventing means (in combination with high tension or heavy-current switches with arc-extinguishing or arc-preventing means H01H 33/00) [3]
H01H 33/00
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High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
H01H 35/00
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Switches operated by change of a physical condition (operated by change of magnetic or electric field H01H 36/00; thermally-actuated switches H01H 37/00)
H01H 36/00
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Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
H01H 37/00
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Thermally-actuated switches
H01H 39/00
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Switching devices actuated by an explosion produced within the device and initiated by an electric current
H01H 41/00
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Switches providing a selected number of consecutive operations of the contacts by a single manual actuation of the operating part
H01H 43/00
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Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operation after the programme is completed
H01H 45/00
Relays
H01H 45/00
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Details of relays (electric circuit arrangements H01H 47/00; of electromagnetic relays H01H 50/00; details of electrically-operated selector switches H01H 63/00)
H01H 47/00
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Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
H01H 49/00
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Apparatus or processes specially adapted to the manufacture of relays or parts thereof
H01H 50/00
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Details of electromagnetic relays (electric circuit arrangements H01H 47/00; details of electrically-operated selector switches H01H 63/00)
H01H 51/00
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Electromagnetic relays (relays using the dynamo-electric effect H01H 53/00)
H01H 53/00
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Relays using the dynamo-electric effect, i.e. relays in which contacts are opened or closed due to relative movement of current-carrying conductor and magnetic field caused by force of interaction between them
H01H 53/01
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Details
H01H 53/015
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. . Moving coilsContact-driving arrangements associated therewith
H01H 53/02
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Electrodynamic relays, i.e. relays in which the interaction is between two current-carrying conductors
H01H 53/04
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. . Ferrodynamic relays, i.e. relays in which the magnetic field is concentrated in ferromagnetic parts
H01H 53/06
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Magnetodynamic relays, i.e. relays in which the magnetic field is produced by a permanent magnet
H01H 53/08
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wherein a mercury contact constitutes the current-carrying conductor
H01H 53/10
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Induction relays, i.e. relays in which the interaction is between a magnetic field and current induced thereby in a conductor
H01H 53/12
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. . Ferraris relays
H01H 53/14
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Contacts actuated by an electric motor through fluid-pressure transmission, e.g. using a motor-driven pump
H01H 55/00
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Magnetostrictive relays
H01H 57/00
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Electrostrictive relaysPiezo-electric relays
H01H 59/00
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Electrostatic relaysElectro-adhesion relays
H01H 61/00
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Electrothermal relays (thermal switches not operated by electrical input, thermal switches with anticipating electrical input H01H 37/00; thermally-sensitive members H01H 37/32)
H01H 63/00
Selectors [3]
H01H 63/00
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Details of electrically-operated selector switches
H01H 65/00
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Apparatus or processes specially adapted to the manufacture of selector switches or parts thereof
H01H 67/00
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Electrically-operated selector switches
H01H 69/00
Emergency protective devices
H01H 69/00
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Apparatus or processes for the manufacture of emergency protective devices
H01H 71/00
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Details of the protective switches or relays covered by groups H01H 73/00-H01H 83/00
H01H 73/00
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Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
H01H 75/00
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Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of power reset mechanism
H01H 77/00
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Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting (H01H 73/00, H01H 75/00 take precedence)
H01H 79/00
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Protective switches in which excess current causes the closing of contacts, e.g. for short-circuiting the apparatus to be protected
H01H 81/00
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Protective switches in which contacts are normally closed but are repeatedly opened and reclosed as long as a condition causing excess current persists, e.g. for current limiting
H01H 83/00
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Protective switches, e.g. circuit-breaking switches, or protective relays operated by abnormal electrical conditions otherwise than solely by excess current
H01H 85/00
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Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive (switches actuated by melting of fusible material H01H 37/76; disposition or arrangement of fuses on boards H02B 1/18)
H01H 87/00
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Protective devices in which a current flowing through a liquid or solid is interrupted by the evaporation of the liquid or by the melting and evaporation of the solid when the current becomes excessive, the circuit continuity being reestablished on cooling [3]
H01H 89/00

H01H 89/00
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Combinations of two or more different basic types of electric switches, relays, selectors and emergency protective devices, not covered by any single one of the other main groups of this subclass [2006.01]
H01J
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ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; arc lamps with consumable electrodes H05B; particle accelerators H05H)
H01K
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ELECTRIC INCANDESCENT LAMPS (details or apparatus or processes for manufacture applicable to both discharge devices and incandescent lamps H01J; light sources using a combination of incandescent and other types of light generation H01J 61/96, H05B 35/00; circuits therefor H05B)
H01L
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SEMICONDUCTOR DEVICESELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR (use of semiconductor devices for measuring G01; resistors in general H01C; magnets, inductors, transformers H01F; capacitors in general H01G; electrolytic devices H01G 9/00; batteries, accumulators H01M; waveguides, resonators, or lines of the waveguide type H01P; line connectors, current collectors H01R; stimulated-emission devices H01S; electromechanical resonators H03H; loudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers H04R; electric light sources in general H05B; printed circuits, hybrid circuits, casings or constructional details of electrical apparatus, manufacture of assemblages of electrical components H05K; use of semiconductor devices in circuits having a particular application, see the subclass for the application) [2]
H01M
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PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY (electrochemical processes or apparatus in general C25; semiconductor or other solid state devices for converting light or heat into electrical energy H01L, e.g. H01L 31/00, H01L 35/00, H01L 37/00) [2]
H01P
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WAVEGUIDESRESONATORS, LINES OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)
H01Q
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AERIALS (microwave radiators for near-field therapeutic treatment A61N 5/04; apparatus for testing aerials or for measuring aerial characteristics G01R; waveguides H01P; radiators or aerials for microwave heating H05B 6/72)
H01R
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ELECTRICALLY-CONDUCTIVE CONNECTIONSSTRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTSCOUPLING DEVICESCURRENT COLLECTORS (switches, fuses H01H; coupling devices of the waveguide type H01P 5/00; switching arrangements for the supply or distribution of electric power H02B; installations of electric cables or lines, or of combined optical and electric cables or lines, or of auxiliary apparatus H02G; printed means for providing electric connections to or between printed circuits H05K)
H01S
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DEVICES USING STIMULATED EMISSION
H01T
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SPARK GAPSOVERVOLTAGE ARRESTERS USING SPARK GAPSSPARKING PLUGSCORONA DEVICESGENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES (working of metal by the action of a high concentration of electric current B23H; welding, e.g. arc welding, electron beam welding or electrolytic welding, B23K; gas-filled discharge tubes with solid cathode H01J 17/00; electric arc lamps H05B 31/00)
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
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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