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H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
H03F1/52—Circuit arrangements for protecting such amplifiers
H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
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FR42009D1931-01-271932-06-29Dispositif pour maintenir constant le courant de repos filament-plaque dans les lampes amplificatrices
ExpiredFR42009E
(fr)