H
ELECTRICITY
Load children
H04
ELECTRIC COMMUNICATION TECHNIQUE
Load children
H04R
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
Load children
1/00
Details of transducers,; loudspeakers or microphones
Load children Filter patents View analytics View as hierarchy
H04R1/02
Casings; Cabinets; ; Supports therefor;; Mountings therein
Load children Filter patents View analytics View as hierarchy
H04R1/028
associated with devices performing functions other than acoustics, e.g. electric candles
Filter patents View analytics View as hierarchy