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Application filed by Josef EnardfiledCriticalJosef Enard
Publication of CH66615ApublicationCriticalpatent/CH66615A/de
CH66615A1913-12-111913-12-11Einrichtung zur Verständigung von Telephonabonnenten seitens der Zentrale von den Gebühren beendigter Gespräche
CH66615A
(de)