|
FR2680621A1
(fr)
|
|
Procede et installation de visiophonie.
|
|
BE335636A
(instruction)
|
|
|
|
US3193620A
(en)
|
|
Supervisory control circuit for multiline telephone answering machine
|
|
US2302587A
(en)
|
|
Telephone trunking system
|
|
US1257317A
(en)
|
|
Telephone-exchange system.
|
|
CH102155A
(fr)
|
|
Installation pour bureau central téléphonique.
|
|
US1235705A
(en)
|
|
Telephone-exchange system.
|
|
US1284533A
(en)
|
|
Telephone-exchange system.
|
|
US1334447A
(en)
|
|
Telephone-exchange system
|
|
US1337976A
(en)
|
|
Telephone system
|
|
US1308554A
(en)
|
|
Call-xistribtjtina system |
|
US1484134A
(en)
|
|
Telephone system
|
|
US2916556A
(en)
|
|
Dial telephone signaling system
|
|
SU88727A1
(ru)
|
|
Схемы шнуровой пары декадно-шаговой автоматической телефонной станции
|
|
BE528427A
(instruction)
|
|
|
|
US1364106A
(en)
|
|
Automatic telephone system
|
|
SU7072A1
(ru)
|
|
Телефонное устройство
|
|
US1813175A
(en)
|
|
Automatic telephone system
|
|
BE410069A
(instruction)
|
|
|
|
US1272689A
(en)
|
|
Telephone-exchange system.
|
|
US1217477A
(en)
|
|
Telephone-exchange supervisory system.
|
|
US1834293A
(en)
|
|
Synchronizing system for electric clocks
|
|
FR2681208A1
(fr)
|
|
Installation d'interphone avec un poste de porte et avec au moins un poste vocal interieur.
|
|
CH95589A
(fr)
|
|
Installation téléphonique d'intercommunication entre un bureau central automatique et un bureau privé annexe.
|
|
BE340109A
(instruction)
|
|
|