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Filing date
Publication date
Application filed by Autophon AgfiledCriticalAutophon Ag
Publication of CH225935ApublicationCriticalpatent/CH225935A/de
H04M3/42—Systems providing special services or facilities to subscribers
H04M3/58—Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Sub-Exchange Stations And Push- Button Telephones
(AREA)
CH225935D1941-02-281941-02-28Schaltungsanordnung in Fernsprechanlagen mit Wählerbetrieb.
CH225935A
(de)