FR1129507A
(en )
1957-01-22
Reversing electrical circuits
CH354121A
(en )
1961-05-15
Telephone subscriber station with anti-eavesdropping
FR1126455A
(en )
1956-11-23
Automatic telephone
CH331709A
(en )
1958-07-31
Switching network for transmission purposes
FR1145178A
(en )
1957-10-23
Automatic telephone
CH332350A
(en )
1958-08-31
Dial for automatic telephony
AT196456B
(en )
1958-03-25
Circuit arrangement for telephone stations with back loss
CH351641A
(en )
1961-01-31
Circuit arrangement in telecommunications systems
CH347861A
(en )
1960-07-31
Rotary dial for telecommunications and telephone systems
AT189240B
(en )
1957-03-11
Telephone station
AT189291B
(en )
1957-03-11
Circuit arrangement for rectifier devices
AT190105B
(en )
1957-06-11
Circuit arrangement for telephone systems with direct remote dialing
CH346248A
(en )
1960-05-15
Telephone system
AT193948B
(en )
1957-12-10
Circuit arrangement for a telephone system with dialer operation
AT199229B
(en )
1958-08-25
Circuit arrangement for telephone systems
AT187154B
(en )
1956-10-25
Number switch for telephones
CH323788A
(en )
1957-08-15
Circuit arrangement for telecommunications systems with motor selectors
AT185410B
(en )
1956-04-25
Circuit arrangement for telephone extension systems with dialer operation
FR70367E
(en )
1959-04-06
Automatic telephone
AT193949B
(en )
1957-12-10
Circuit arrangement for community connections in telephone systems
AT174090B
(en )
1953-02-25
Circuit arrangement for telephone systems with direct dialing
AT186677B
(en )
1956-09-10
Circuit arrangement for a subscriber line
AT193437B
(en )
1957-11-25
Handset for telephone stations
FR1156776A
(en )
1958-05-21
Telephone dial
AT193438B
(en )
1957-11-25
Telephone station with amplifier