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BE483085A
(h)
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|
|
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US2468057A
(en)
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Multioffice telephone system
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US2575882A
(en)
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Connecting device at crossbar switch for selection of connecting links
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NO116699B
(h)
|
|
|
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US1242384A
(en)
|
|
Automatic telephone system.
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BE391837A
(h)
|
|
|
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US1254679A
(en)
|
|
Automatic telephone-exchange system.
|
|
BE436878A
(h)
|
|
|
|
US1688725A
(en)
|
|
Machine switching system for telephone exchanges
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|
US1174434A
(en)
|
|
Telephone pay-station.
|
|
US1336098A
(en)
|
|
Telephone system
|
|
SU1599A1
(ru)
|
|
Автоматическа или полуавтоматическа телефонна система
|
|
US1393522A
(en)
|
|
Telephone-exchange system
|
|
BE350991A
(h)
|
|
|
|
DE579888C
(de)
|
|
Schaltungsanordnung fuer Fernsprechanlagen mit Waehlerbetrieb
|
|
BE460754A
(h)
|
|
|
|
DE110626C
(h)
|
|
|
|
GB315482A
(en)
|
|
Improvements in or relating to automatic and semi-automatic telephone systems
|
|
GB228720A
(en)
|
|
Improvements relating to selectors for automatic telephone systems and the like
|
|
GB247742A
(en)
|
|
Improvements in automatic or semi-automatic telephone systems
|
|
GB324982A
(en)
|
|
Improvements in or relating to automatic or semi-automatic telephone systems
|
|
GB694726A
(en)
|
|
Improvements relating to telephone systems
|
|
BE501756A
(h)
|
|
|
|
CH135611A
(fr)
|
|
Installation téléphonique.
|
|
DE1249946B
(de)
|
|
Schaltungsanordnung für eine zentral gesteuerte Fernsprechnebenstellenanlage mit einem Vermittlungsplatz
|