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 Siemens AgfiledCriticalSiemens Ag
Publication of CH353408ApublicationCriticalpatent/CH353408A/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
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04M—TELEPHONIC COMMUNICATION
H04M1/00—Substation equipment, e.g. for use by subscribers
H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Selective Calling Equipment
(AREA)
Telephonic Communication Services
(AREA)
CH353408D1956-09-281957-09-24Schaltungsanordnung für Teilnehmerstelle in Fernmelde-, insbesondere Fernsprechanlagen, mit Tastaturwahl
CH353408A
(de)