ELEKTROMECHANISCHE TELEPHONAPP innovation strategy

Publication	Filing date	Title
DE330557C	1919-02-27	Circuit arrangement for telephone systems with electromechanically controlled switching devices
DE321300C	1914-10-13	Circuit arrangement for telephone systems with automatic or semi-automatic operation
DE324072C	1914-09-20	Circuit arrangement for telephone systems operated with automatic switchgear
DE319923C	1914-09-20	Circuit arrangement for telephone systems operated with automatic switchgear
DE322085C	1914-06-05	Circuit arrangement for automatic or semi-automatic telephone systems
DE328696C	1914-01-21	Election power sender
DE335822C	1913-12-17	Circuit arrangement for private branch exchanges
DE319784C	1913-11-25	Circuit arrangement for telephone systems
DE322248C	1913-11-16	Circuit arrangement for telephone systems