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
Application filed by Bell Telephone MfgfiledCriticalBell Telephone Mfg
Priority to BE587747ApriorityCriticalpatent/BE587747R/fr
Application grantedgrantedCritical
Publication of BE587747RpublicationCriticalpatent/BE587747R/fr
Priority to DE19611424402prioritypatent/DE1424402A1/de