FR1044709A
(en )
1953-11-20
Selector for automatic telephone exchanges
CH276285A
(en )
1951-06-30
Subscriber telephone set circuit.
CH304196A
(en )
1954-12-31
Telephone system with subscriber set.
CH287723A
(en )
1952-12-15
Automatic switching device for telecommunication exchange.
FR1023959A
(en )
1953-03-26
Improvements to automatic telephone exchanges
CH276568A
(en )
1951-07-15
Subscriber circuit in an automatic telephone system.
DK77899C
(en )
1954-08-02
Device at automatic telephone exchanges for call billing.
CH297628A
(en )
1954-03-31
Subscriber circuit for call seekers.
DK81237C
(en )
1956-07-02
Device for diverting ringing signals by telephone sets.
CH343462A
(en )
1959-12-31
Telephone subscriber set
DK77276C
(en )
1954-03-22
Coupling to automatic telephone exchanges for sending out automatically repeated ringtones.
DK89108C
(en )
1960-06-07
Line selection system for automatic telephone exchanges.
DK82374C
(en )
1957-03-25
Coupling device at automatic telephone stations.
AT185412B
(en )
1956-04-25
Automatic telephone dialing system
CH273262A
(en )
1951-01-31
Device to remember a number to be dialed to an automatic telephone for the call.
DK75049C
(en )
1952-12-01
Telephone subscriber device.
CH278196A
(en )
1951-09-30
Additional device for amplifying telephone calls.
FI26299A
(en )
1953-03-13
A device to facilitate nemero dialing when making a call on an automatic telephone
CH275990A
(en )
1951-06-15
Telephone subscriber station.
FR1020507A
(en )
1953-02-06
Device for disinfecting a telephone microphone
DK89645C
(en )
1960-09-05
Coupling to inquiry calls at private automatic telephone exchanges.
ES188722A1
(en )
1949-09-01
AN ACCESSORY FOR A SUBSCRIBER TELEPHONE APPLIANCE
DK80749C
(en )
1956-03-26
Coordinator of the coordinate dial type for automatic telephone exchanges.
FR59587E
(en )
1954-06-28
Crossbar switch for automatic telephone systems
DK72315C
(en )
1951-03-27
Device for fork contacts in telephone sets.