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incorporating only one transducer
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Industry
CPC
H04R1/021
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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
H04R1/00
Details of transducers, loudspeakers or microphones
Current Industry
H04R1/021
incorporating only one transducer
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