DIFF Subgroup
H03F 3/343 with semiconductor devices only
Introduced: July 1974
Full Title
Full titles differ between systems:
IPC:
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > DC amplifiers in which all stages are DC-coupled > with semiconductor devices only
CPC:
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements > DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence) > with semiconductor devices only
Of 3 combined children, 2 exist in both systems.
1 codes are CPC-only extensions.
1 shared codes have differing titles between IPC and CPC.
IPC defines codes here since 1974.
Child Classifications
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- H03F 3/345 with field-effect devices (H03F3/347 takes precedence) since 1974 +1 CPC IPC+CPC Available in IPC and CPC