DIFF Subgroup
H01F 21/12 discontinuously variable, e.g. tapped
Introduced: September 1968
Full Title
Full titles differ between systems:
IPC:
Variable inductances or transformers of the signal type > discontinuously variable, e.g. tapped
CPC:
Variable inductances or transformers of the signal type (H01F36/00 takes precedence) > discontinuously variable, e.g. tapped
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.
Child Classifications
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