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FR2680621A1
(fr)
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Procede et installation de visiophonie.
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BE335636A
(Direct)
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US3193620A
(en)
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Supervisory control circuit for multiline telephone answering machine
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US2302587A
(en)
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Telephone trunking system
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US1257317A
(en)
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Telephone-exchange system.
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CH102155A
(fr)
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Installation pour bureau central téléphonique.
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US1235705A
(en)
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Telephone-exchange system.
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US1334447A
(en)
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Telephone-exchange system
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US1337976A
(en)
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Telephone system
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US1308554A
(en)
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Call-xistribtjtina system |
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US1230117A
(en)
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Telephone-exchange system.
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US1484134A
(en)
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Telephone system
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US2916556A
(en)
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Dial telephone signaling system
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SU88727A1
(ru)
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Схемы шнуровой пары декадно-шаговой автоматической телефонной станции
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BE528427A
(Direct)
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SU7072A1
(ru)
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Телефонное устройство
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US1813175A
(en)
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Automatic telephone system
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US1272689A
(en)
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Telephone-exchange system.
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US1217477A
(en)
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Telephone-exchange supervisory system.
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US1075259A
(en)
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Telephony.
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US1298588A
(en)
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Telephone system.
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US1762986A
(en)
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Telephone system
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CH95589A
(fr)
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Installation téléphonique d'intercommunication entre un bureau central automatique et un bureau privé annexe.
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BE340109A
(Direct)
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CH198010A
(fr)
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Installation téléphonique à batterie centrale.
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