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H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
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FR688979D1929-01-281930-01-27Perfectionnements aux amplificateurs thermioniques destinés aux phonographes électriques et appareils analogues
ExpiredFR688979A
(fr)