Patent classifications
H
ELECTRICITY
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H01
ELECTRIC ELEMENTS
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H01F
MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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30/00
Fixed transformers not covered by group H01F19/00
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H01F30/06
characterised by the structure
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H01F30/12
Two-phase, three-phase or polyphase transformers
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H01F30/14
for changing the number of phases
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