DIFF Main Group
H04R 7/00 Diaphragms for electromechanical transducers (in general F16J3/00); Cones (for musical instruments G10 )
Introduced: September 1968
Title
Titles differ between systems:
IPC: Diaphragms for electromechanical transducers; Cones
CPC: Diaphragms for electromechanical transducers (in general F16J3/00); Cones (for musical instruments G10 )
Full Title
Full titles differ between systems:
IPC:
Diaphragms for electromechanical transducers; Cones
CPC:
Diaphragms for electromechanical transducers (in general F16J3/00); Cones (for musical instruments G10 )
IPC and CPC are identically structured here. All 3 subcodes exist in both systems.
1 shared codes have differing titles between IPC and CPC.
Child Classifications
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- H04R 7/26 Damping by means acting directly on free portion of diaphragm or cone (air damping H04R1/28) IPC+CPC Available in IPC and CPC