DIFF Subgroup Additional Only
H03F 2203/20 Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers
Full Title
Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00 > Indexing scheme relating to power amplifiers, e.g. Class B amplifiers, Class C amplifiers
Of 1 combined children, 0 exist in both systems.
1 codes are CPC-only extensions.
Note: 1 CPC extensions are marked as secondary classification only.