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.)
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Application filed by Bell Telephone Mfg Company S AfiledCriticalBell Telephone Mfg Company S A
Priority to BE573779ApriorityCriticalpatent/BE573779R/fr
Application grantedgrantedCritical
Publication of BE573779RpublicationCriticalpatent/BE573779R/fr