CH276285A
(en )
1951-06-30
Subscriber telephone set circuit.
FR1109009A
(en )
1956-01-20
Telephone circuit
FR1023959A
(en )
1953-03-26
Improvements to automatic telephone exchanges
CH276568A
(en )
1951-07-15
Subscriber circuit in an automatic telephone system.
FI26299A
(en )
1953-03-13
A device to facilitate nemero dialing when making a call on an automatic telephone
CH273262A
(en )
1951-01-31
Device to remember a number to be dialed to an automatic telephone for the call.
AT185412B
(en )
1956-04-25
Automatic telephone dialing system
FR1020507A
(en )
1953-02-06
Device for disinfecting a telephone microphone
DK77276C
(en )
1954-03-22
Coupling to automatic telephone exchanges for sending out automatically repeated ringtones.
AT172866B
(en )
1952-10-25
Dial with call switch
CA464882A
(en )
1950-05-02
Dial telephone calling device
ES188722A1
(en )
1949-09-01
AN ACCESSORY FOR A SUBSCRIBER TELEPHONE APPLIANCE
DK77899C
(en )
1954-08-02
Device at automatic telephone exchanges for call billing.
DK75049C
(en )
1952-12-01
Telephone subscriber device.
CA461519A
(en )
1949-11-29
Telephone calling dial
CA461513A
(en )
1949-11-29
Telephone call transmitting device
FR70823E
(en )
1959-09-01
Improvements to telephone call dials
CH281295A
(en )
1952-02-29
Keypad on a subscriber set.
DK82374C
(en )
1957-03-25
Coupling device at automatic telephone stations.
AU149772B2
(en )
1949-09-08
A telephone test circuit
AT179570B
(en )
1954-09-10
Automatic telephone exchange
AU146124B2
(en )
Call tracing arrangements in automatic telephone systems
CH297626A
(en )
1954-03-31
Automatic telephone installation.
AT181643B
(en )
1955-04-12
Telephone subscriber circuit
FI25164A
(en )
1951-07-10
Automatic telephone retrieval