GB1013594A
(en )
1965-12-15
Improvements in communication switching systems
GB1068227A
(en )
1967-05-10
Improvements in or relating to switching networks for use in telecommunications installations
GB687397A
(en )
1953-02-11
Improvements in or relating to telephone exchange systems
SE327219B
(da )
1970-08-17
GB963900A
(en )
1964-07-15
Telephone line concentrators or the like
GB741589A
(en )
1955-12-07
Improvements in or relating to automatic telephone exchange systems
ES377981A1
(es )
1972-06-16
Mejoras en los sistemas de seleccion para circuitos o equi-pos electricos.
GB1018237A
(en )
1966-01-26
Improvements in and relating to devices for use in an automatic telephone system
GB836558A
(en )
1960-06-01
Improvements in or relating to automatic telephone systems
GB804042A
(en )
1958-11-05
Improvements in or relating to telephone systems
GB1019480A
(en )
1966-02-09
Circuit arrangement to release registers in telecommunication, particularly telephone systems
GB794815A
(en )
1958-05-14
Improvements in or relating to automatic telecommunication exchange
GB725733A
(en )
1955-03-09
Improvements in or relating to circuits for use in automatic telephone systems
US3341661A
(en )
1967-09-12
Equipment for operator served calls at an intermediate switching center
GB926972A
(en )
1963-05-22
A circuit arrangement for a telecommunication installation
GB1264576A
(da )
1972-02-23
GB915973A
(en )
1963-01-16
Improvements in or relating to automatic telephone switching systems
GB813339A
(en )
1959-05-13
Improvements in or relating to electrical signalling systems
GB925817A
(en )
1963-05-08
Improvements in or relating to circuit arrangements for characterising the origin oftrunk dialling calls in central evaluating arrangements
AU3357963A
(en )
1965-02-04
Improvements relating top. b. x. final selector arrangements in automatic telephone exchange systems
GB1074038A
(en )
1967-06-28
Improvements in or relating to telecommunications exchange systems
GB957908A
(en )
1964-05-13
Telephone switching systems
GB1024196A
(en )
1966-03-30
Circuit arrangement for pabxs with key-dialling and tie-lines to other pabxs
GB1017790A
(en )
1966-01-19
Improvements in or relating to telecommunications systems
GB1022338A
(en )
1966-03-09
Electrical systems employing common equipment