Schaltvorrichtung fuer Fernsprechgeraete zur Veraenderung der Lautstaerke fuer Telefone

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Bibliographic Details
Main Author BUETTEL HELMUT
Format Patent
LanguageGerman
Published 15.11.1956
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TELEPHONIC COMMUNICATION
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Bibliography:Application Number: DE1953M019484