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disposition of the granular chamber in microphones
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CPC
H04R21/025
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Parent Industries
H
ELECTRICITY
H04
Electric communication
H04R
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS DEAF-AID SETS PUBLIC ADDRESS SYSTEMS
H04R21/00
Variable-resistance transducers
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H04R21/025
disposition of the granular chamber in microphones
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CPC
H04R21/025
