DIFF Subgroup
H04R 17/02 Microphones
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Piezoelectric transducers; Electrostrictive transducers > Microphones
CPC:
Piezoelectric transducers; Electrostrictive transducers (piezoelectric or electrostrictive elements in general H10N30/00; details of piezoelectric or electrostrictive motors, generators or positioners ) > Microphones
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Child Classifications
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