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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7/00
Diaphragms for electromechanical transducers; Cones
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H04R7/02
characterised by the construction
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H04R7/12
Non-planar diaphragms or cones
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H04R7/14
corrugated, pleated or ribbed
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