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H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
H01F21/00—Variable inductances or transformers of the signal type
H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers
H01F21/04—Variable inductances or transformers of the signal type continuously variable, e.g. variometers by relative movement of turns or parts of windings
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FR31452D1925-07-221925-07-22Perfectionnements dans les transformateurs à haute fréquence pour amplificateurs
ExpiredFR31452E
(fr)