Patent Classification Explorer PCE

DIFF Main Group

H03G 9/00

Combinations of two or more types of control, e.g. gain control and tone control

Introduced: September 1968

Of 4 combined children, 3 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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H03G 9/005 CPC only CPC only
H03G 9/02 in untuned amplifiers +1 CPC IPC+CPC Available in IPC and CPC
H03G 9/20 in frequency-selective amplifiers IPC+CPC Available in IPC and CPC
H03G 9/26 in untuned amplifying stages as well as in frequency-selective amplifying stages IPC+CPC Available in IPC and CPC