CH291949A
(en )
1953-07-15
Circuit for telephone systems for receiving signals.
CH279120A
(en )
1951-11-15
Circuit arrangement in an automatic signal system.
DK78418C
(en )
1954-11-15
Common line circuit arrangement for a group of substation lines in an automatic remote signaling center.
CH300169A
(en )
1954-07-15
Circuit for commissioning transformers.
CH320151A
(en )
1957-03-15
Automatic telecommunication exchange equipment
CH313271A
(en )
1956-03-31
Circuit arrangement for an automatic telephone system
CH313059A
(en )
1956-03-15
Automatic telephone switchboard facility
FR1030482A
(en )
1953-06-15
Autonomous generator group, in particular for signaling
CH272952A
(en )
1951-01-15
Circuit arrangement for signaling via telephone lines.
AT185412B
(en )
1956-04-25
Automatic telephone dialing system
CH297626A
(en )
1954-03-31
Automatic telephone installation.
DK89108C
(en )
1960-06-07
Line selection system for automatic telephone exchanges.
AU145961B2
(en )
1949-09-08
Circuit arrangement fora subscribers circuit inan automatic signal system
CA460749A
(en )
1949-11-01
Tie lines for automatic telephone exchange
DK79201C
(en )
1955-05-02
Automatic remote signaling system with means for telephone guard.
AT171625B
(en )
1952-06-25
Switching device for automatic telephone systems
AT168002B
(en )
1951-04-10
Circuit arrangement for line selectors in telephone systems
DK83711C
(en )
1957-10-21
Electrical signaling system.
DK78030C
(en )
1954-08-30
Connection to an automatic signaling system.
DK89313C
(en )
1960-07-11
Electrical signaling equipment for use in an automatic telecommunication center.
AT181641B
(en )
1955-04-12
Telephone switching system
AT174090B
(en )
1953-02-25
Circuit arrangement for telephone systems with direct dialing
AT176882B
(en )
1953-12-10
Circuit arrangement for automatic telephone switching equipment
DK80248C
(en )
1955-12-12
Power supply systems for remote signaling systems.
CA460237A
(en )
1949-10-11
Automatic telephone system