H
ELECTRICITY
H
ELECTRICITY
H04
ELECTRIC COMMUNICATION TECHNIQUE
H04
ELECTRIC COMMUNICATION TECHNIQUE
H04R
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
H04R
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
2201/00
Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
2201/00
Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
H04R2201/003
Mems transducers or their use
H04R2201/003
Mems transducers or their use