IPC Main Group
H01F 21/00 Variable inductances or transformers of the signal type
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- ELECTRICITY
- Class:
- ELECTRIC ELEMENTS
- Subclass:
- MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
2 direct subcodes
Child Classifications
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- H01F 21/02 continuously variable, e.g. variometers
- H01F 21/12 discontinuously variable, e.g. tapped