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 Associated Telephone & Telegraph CompanyfiledCriticalAssociated Telephone & Telegraph Company
Priority to GR270101700ApriorityCriticalpatent/GR1700B/en
Publication of GR1700BpublicationCriticalpatent/GR1700B/en