DIFF Subgroup
H01F 30/12 Two-phase, three-phase or polyphase transformers
Introduced: January 1995
Full Title
Full titles differ between systems:
IPC:
Fixed transformers not covered by group > characterised by the structure > Two-phase, three-phase or polyphase transformers
CPC:
Fixed transformers not covered by group H01F19/00 > characterised by the structure > Two-phase, three-phase or polyphase transformers
IPC and CPC are identically structured here. All 1 subcodes exist in both systems.
IPC defines codes here since 1995.
Child Classifications
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