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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21/00
Variable inductances or transformers of the signal type
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H01F21/02
continuously variable, e.g. variometers
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H01F21/08
by varying the permeability of the core, e.g. by varying magnetic bias
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