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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2225/00
Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
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H04R2225/021
Behind the ear [BTE] hearing aids
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H04R2225/0216
BTE hearing aids having a receiver in the ear mould
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