IPC Subgroup
H04R 7/04 Plane diaphragms
Introduced: September 1968
Last revised: January 2006
Full Title
Diaphragms for electromechanical transducers; Cones > characterised by the construction > Plane diaphragms
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
1 direct subcode
Child Classifications
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- H04R 7/06 comprising a plurality of sections or layers