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H01C8/00—Non-adjustable resistors consisting of loose powdered or granular conducting, or powdered or granular semi-conducting material
H01C8/02—Coherers or like imperfect resistors for detecting electromagnetic waves
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FR477D1900-01-221902-04-28Récepteur téléphonique des dépeches envoyées au moyen des oscillations électromagnétiques par signaux de l'alphabet morse
ExpiredFR477E
(fr)