Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04R
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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1/00
Details of transducers,; loudspeakers or microphones
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H04R1/10
Earpieces; Attachments therefor; ; Earphones; Monophonic headphones
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H04R1/1016
Earpieces of the intra-aural type
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