CPC Subgroup
H01F 30/14 for changing the number of phases
Full Title
Fixed transformers not covered by group H01F19/00 > characterised by the structure > Two-phase, three-phase or polyphase transformers > for changing the number of phases
H01F 30/14 Fixed transformers not covered by group H01F19/00 > characterised by the structure > Two-phase, three-phase or polyphase transformers > for changing the number of phases