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- Google Patents
BE776002A - Dispositif pour intercommunications telephoniques en duplex a l'aide dehaut-parleurs.
- Google Patents
Dispositif pour intercommunications telephoniques en duplex a l'aide dehaut-parleurs.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE563860DpriorityCriticalpatent/BE563860A/fr
Application filed by Challe Claude A EfiledCriticalChalle Claude A E
Priority to BE776002Aprioritypatent/BE776002A/xx
Publication of BE776002ApublicationCriticalpatent/BE776002A/xx