IPC Subgroup
H04R 1/2 Arrangements for obtaining desired frequency or directional characteristics
Introduced: September 1968
Last revised: January 2006
Full Title
Details of transducers > Arrangements for obtaining desired frequency or directional characteristics
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: Arrangements for obtaining desired frequency or directional characteristics for stereophonic purposes
2 direct subcodes
Child Classifications
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