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 Telefonapparatfabrikanterne AufiledCriticalTelefonapparatfabrikanterne Au
Application grantedgrantedCritical
Publication of DK32540CpublicationCriticalpatent/DK32540C/en
DK32540D1919-05-151920-03-06
Procedure and Apparatus for Operating Automatic Devices for Automatic and Semi-Automatic Telephone Systems and the Like.
DK32540C
(en)