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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29/00
Variable transformers or inductances not covered by group H01F21/00
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H01F29/08
with core, coil, winding, or shield movable to offset variation of voltage or phase shift, e.g. induction regulators
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H01F29/12
having movable coil, winding, or part thereof; having movable shield
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