IPC Subgroup
H04R 1/04 Structural association of microphone with electric circuitry therefor
Introduced: September 1968
Last revised: January 2006
Full Title
Details of transducers > Casings; Cabinets; Mountings therein > Structural association of microphone with electric circuitry therefor
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC COMMUNICATION TECHNIQUE
- Subclass:
- LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
Scope Notes
Limiting references: Structural association of microphone with electric circuitry therefor in electric hearing aids