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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 (transmission systems for measured values, control or similar signals G08C; speech analysis or synthesis G10L; coding, decoding or code conversion, in general H03M; broadcast communication H04H; multiplex systems H04J; secret communication H04K; transmission of digital information H04L) [4]
H04H
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BROADCAST COMMUNICATION (transmission in general H04B; multiplex communication H04J)
H04J
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MULTIPLEX COMMUNICATION (transmission in general H04B; 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; stereophonic systems H04S)
H04K
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SECRET COMMUNICATIONJAMMING OF COMMUNICATION
H04L
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TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (typewriters B41J; order telegraphs, fire or police telegraphs G08B; visual telegraphy G08B, G08C; teleautographic systems G08C; ciphering or deciphering apparatus per seG09C; coding, decoding or code conversion, in general H03M; arrangements common to telegraphic and telephonic communication H04M; selecting H04Q) [4]
H04M
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TELEPHONIC COMMUNICATION (counting mechanisms G06M; circuits for controlling other apparatus via a telephone cable and not involving telephone switching apparatus G08; reels or other take-up devices for cords H02G 11/00; multiplex transmission between switching centres H04J; selecting arrangements H04Q; loudspeakers, microphones, gramophone pick-ups or like electromechanical transducers H04R)
H04N
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PICTORIAL COMMUNICATION, e.g. TELEVISION (measuring, testing G01; systems for autographic writing, e.g. writing telegraphy, which involve following an outline G08; information storage based on relative movement between record carrier and transducer G11B; coding, decoding or code conversion, in general H03M; broadcast distribution or the recording of use made thereof H04H) [4]
H04Q
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SELECTING (switches, relays, selectors H01H; electronic switches H03K 17/00)
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]
H04R 1/00
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Details of transducers (diaphragms H04R 7/00; characterised by the nature of the transducer, see the relevant group of main groups H04R 9/00-H04R 23/00; mounting radio sets or communication systems in helmets A42B 3/30; mountings specially adapted for telephone equipment H04M 1/02)
H04R 3/00
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Circuits for transducers (for stereophonic arrangements H04R 5/04; arrangements for producing a reverberation or echo sound G10K 15/08; amplifiers H03F)
H04R 5/00
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Stereophonic arrangements (stereophonic pick-ups H04R 9/16, H04R 11/12, H04R 17/08, H04R 19/10)
H04R 7/00
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Diaphragms for electromechanical transducers (in general F16J 3/00)Cones (for musical instruments G10)
H04R 7/02
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characterised by the construction
H04R 7/04
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. . Plane diaphragms
H04R 7/06
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. . . comprising a plurality of sections or layers
H04R 7/08
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. . . . comprising superposed layers separated by air or other fluid
H04R 7/10
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. . . . comprising superposed layers in contact
H04R 7/12
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. . Non-planar diaphragms or cones
H04R 7/14
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. . . corrugated, pleated, or ribbed
H04R 7/16
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Mounting or tensioning of diaphragms or cones
H04R 7/18
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. . at the periphery
H04R 7/20
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. . . Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
H04R 7/22
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. . . Clamping rim of diaphragm or cone against seating
H04R 7/24
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. . Tensioning by means acting directly on free portion of diaphragm or cone
H04R 7/26
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Damping by means acting directly on free portion of diaphragm or cone (air damping H04R 1/28)
H04R 9/00
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Transducers of moving-coil, moving-strip, or moving-wire type
H04R 11/00
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Transducers of moving-armature or moving-core type (acoustic diaphragm of magnetisable material directly co-acting with electromagnet H04R 13/00)
H04R 13/00
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Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
H04R 15/00
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Magnetostrictive transducers (magnetostrictive elements in general H01L 41/00)
H04R 17/00
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Piezo-electric transducersElectrostrictive transducers (piezo-electric or electrostrictive elements in general H01L 41/00; details of piezo-electric or electrostrictive motors, generators or positioners H02N 2/00)
H04R 19/00
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Electrostatic transducers
H04R 21/00
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Variable-resistance transducers (gaseous-resistance transducers H04R 23/00; magneto-resistive transducers H04R 23/00)
H04R 23/00
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Transducers other than those covered by groups H04R 9/00-H04R 21/00
H04R 25/00
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Deaf-aid sets (constructions of transducers per seH04R 9/00-H04R 23/00; structural combination with spectacle frames G02C 11/06; processing of speech signals G10L 21/00)
H04R 27/00
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Public address systems (circuits for preventing acoustic reaction H04R 3/02; circuits for distributing signals to loud-speakers H04R 3/12; amplifiers H03F)
H04R 29/00
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Monitoring arrangementsTesting arrangements
H04R 31/00
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Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor (processes or apparatus specially adapted for the manufacture of micro-structural devices or systems, e.g. in combination with electrical devices, B81C)
H04S
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STEREOPHONIC SYSTEMS (information storage on discs or tapes G11B; broadcast systems for the distribution of stereophonic information H04H 5/00; multiplex systems in general H04J) [3]
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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