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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H04R1/02
Casings; Cabinets; ; Supports therefor;; Mountings therein
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H04R1/028
associated with devices performing functions other than acoustics, e.g. electric candles
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