FR1382204A
(en )
1964-12-18
Telephone switching system
NL147552B
(en )
1975-10-15
COMMUNICATION SYSTEM.
DK115124B
(en )
1969-09-08
Program-controlled communication switching system.
BE597188A
(en )
1961-03-15
Telephone switching system.
DK118832B
(en )
1970-10-12
Telephone set.
NL147000B
(en )
1975-08-15
TELEPHONE SWITCHING SYSTEM WITH TIME DIVIDING.
CH429821A
(en )
1967-02-15
Telecommunication system
CH411047A
(en )
1966-04-15
Electronically switching telecommunications system
NL142556B
(en )
1974-06-17
TELEPHONE SWITCHING SYSTEM WITH PBX CENTRALS.
BE606073A
(en )
1962-01-15
Signaling system for subscriber devices.
BE609823A
(en )
1962-02-15
Integrated telephone switching system.
NL145733B
(en )
1975-04-15
TIME MULTIPLEX TELECOMMUNICATIONS SYSTEM.
BE615460A
(en )
1962-09-24
Switching for telecommunication systems, mainly intercommunication systems
CH412998A
(en )
1966-05-15
Centrally controlled switching system, in particular for telephone purposes
NL143394B
(en )
1974-09-16
COMMUNICATION SYSTEM.
BE619155A
(en )
1962-12-20
Signaling method for telecommunication, mainly telephone systems.
CH411046A
(en )
1966-04-15
Centrally controlled switching system, in particular for telephone purposes
DK103242C
(en )
1965-12-06
Automatic telephone exchange.
BE574887A
(en )
1959-07-20
Loudspeaker telecommunication system.
NL140120B
(en )
1973-10-15
SPEAKING TELEPHONE.
CH423869A
(en )
1966-11-15
Telegraph system
CH412997A
(en )
1966-05-15
Centrally controlled switching system, in particular for telephone purposes
FR1315767A
(en )
1963-01-25
Telecommunication systems
DK104969C
(en )
1966-07-25
Topic for filing boxes.
CH434370A
(en )
1967-04-30
Electroacoustic switching system