DIFF Subgroup
H03F 3/34 DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence)
Introduced: September 1968
Title
Titles differ between systems:
IPC: DC amplifiers in which all stages are DC-coupled
CPC: DC amplifiers in which all stages are DC-coupled (H03F3/45 takes precedence)
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
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)
IPC and CPC are identically structured here. All 2 subcodes exist in both systems.
Child Classifications
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