DIFF Subgroup
H03F 1/52 Circuit arrangements for protecting such amplifiers
Introduced: January 1980
Full Title
Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements > Circuit arrangements for protecting such amplifiers
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
IPC defines codes here since 1980.
Child Classifications
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