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Publication of AT247923BpublicationCriticalpatent/AT247923B/de
H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/26—Devices for calling a subscriber
H04M1/30—Devices which can set up and transmit only one digit at a time
H04M1/50—Devices which can set up and transmit only one digit at a time by generating or selecting currents of predetermined frequencies or combinations of frequencies
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Telephonic Communication Services
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AT226965A1964-03-141965-03-12Anordnung für die Übertragung von Mehrfrequenzcode-Tastaturwählzeichen in Fernmelde-, insbesondere Fernsprechanlagen
AT247923B
(de)
Schaltungsanordnung für Fernmelde-, insbesondere Fernsprechanlagen, in denen von den Teilnehmerstellen Wählkennzeichen und Informationskennzeichen ausgesendet werden