DIFF Subgroup
H03F 3/191 Tuned amplifiers (H03F3/193, H03F3/195 take precedence)
Introduced: July 1974
Title
Titles differ between systems:
IPC: Tuned amplifiers
CPC: Tuned amplifiers (H03F3/193, H03F3/195 take precedence)
Full Title
Full titles differ between systems:
IPC:
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > High-frequency amplifiers, e.g. radio frequency amplifiers > with semiconductor devices only > Tuned amplifiers
CPC:
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > High-frequency amplifiers, e.g. radio frequency amplifiers > with semiconductor devices only > Tuned amplifiers (H03F3/193, H03F3/195 take precedence)
No child classifications to compare. This is a leaf node in both IPC and CPC.