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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
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2201/00
Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
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H04R2201/02
Details casings, cabinets or mounting therein for transducers covered by H04R1/02 but not provided for in any of its subgroups
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H04R2201/021
Transducers or their casings adapted for mounting in or to a wall or ceiling
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