GB554091A
(en )
1943-06-18
Telephone systems
US2724018A
(en )
1955-11-15
Method of line scanning for automatic telephone systems
SE100794C1
(enrdf_load_stackoverflow )
1940-01-01
GB645867A
(en )
1950-11-08
Telecommunication exchange
GB560807A
(en )
1944-04-20
Improvements in telephone or like systems
GB484658A
(en )
1938-05-02
Improvements in or relating to telephone or like systems
GB788595A
(en )
1958-01-02
Improvements in or relating to automatic telecommunication exchange systems
GB781563A
(en )
1957-08-21
Improvements in or relating to time division multiplex communication systems
AT317311B
(de )
1974-08-26
Übertrager für bipolare Impulse
US2852609A
(en )
1958-09-16
Multiplex signaling system
GB1230397A
(enrdf_load_stackoverflow )
1971-04-28
GB555523A
(en )
1943-08-26
Bridge-stabilised oscillators for voice frequency circuits
GB635305A
(en )
1950-04-05
Mounting arrangements for discharge tubes
GB621817A
(en )
1949-04-20
Improvements in or relating to counting devices comprising discharge tubes
GB737778A
(en )
1955-09-28
Arrangement in an automatic telecommunication exchange, for determining to which of a plurality of service classes a desired connection between two subscribers belongs
GB647073A
(en )
1950-12-06
Arrangement for providing particular characteristics in a line circuit
GB756419A
(en )
1956-09-05
Improvements in or relating to electrical switching circuits
GB759656A
(en )
1956-10-24
A telephone system comprising a main exchange and a satellite exchange
GB1070378A
(en )
1967-06-01
Automatic telecommunication exchange systems
GB554491A
(en )
1943-07-06
Telephone systems
GB1285321A
(en )
1972-08-16
Transmission line circuits
GB926465A
(en )
1963-05-15
Improvements in or relating to electrical traffic analysers
GB684531A
(en )
1952-12-17
Improvements in or relating to telephone systems
GB393662A
(en )
1933-06-12
Improvements in or relating to telegraph exchange systems
ES182159A1
(es )
1948-04-01
UN DISPOSITIVO DE CONMUTACIoN PARA SISTEMAS TELEFoNICOS