CH321711A
(en )
1957-05-15
Automatic telephone exchange system
FR1044709A
(en )
1953-11-20
Selector for automatic telephone exchanges
CH312455A
(en )
1955-12-31
Telecommunication system.
CH300212A
(en )
1954-07-15
Central automatic telecommunication office.
CH275635A
(en )
1951-05-31
Automatic telephone registration system.
CH304196A
(en )
1954-12-31
Telephone system with subscriber set.
CH310991A
(en )
1955-11-15
Automatic telecommunication center.
DK89108C
(en )
1960-06-07
Line selection system for automatic telephone exchanges.
CH312454A
(en )
1955-12-31
Selection installation for telecommunication system.
CH304203A
(en )
1954-12-31
Telecommunication system.
CH291946A
(en )
1953-07-15
Rotary selector for automatic telephone systems.
DK77276C
(en )
1954-03-22
Coupling to automatic telephone exchanges for sending out automatically repeated ringtones.
AT185412B
(en )
1956-04-25
Automatic telephone dialing system
DK77095C
(en )
1954-02-15
Rotatable switch for automatic telephone systems.
DK76923C
(en )
1954-01-04
Selects, especially for automatic telephone systems.
CH297626A
(en )
1954-03-31
Automatic telephone installation.
DK87491C
(en )
1959-06-29
Automatic telecommunication center.
DK87757C
(en )
1959-08-31
Automatic telecommunication center.
DK91778C
(en )
1961-09-18
Automatic telecommunication center.
DK87335C
(en )
1959-05-25
Systems for automatic telephone exchanges.
DK75936C
(en )
1953-06-08
Coordinate selector for automatic telephone systems.
DK75604C
(en )
1953-03-23
Coordinate selector for automatic telephone systems.
DK75210C
(en )
1952-12-29
Coordinate selector for automatic telephone systems.
DK78237C
(en )
1954-10-11
Local telephone system.
CH272112A
(en )
1950-11-30
Telephone.