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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
H01F21/005—Inductances without magnetic core
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Power Engineering
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FR570761D1923-09-031923-09-03Dispositif variométrique nouveau d'appareil d'accord applicable à la télégraphieou à la téléphonie sans fil
ExpiredFR570761A
(fr)