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BE424095A
(cs)
|
|
|
|
US2652446A
(en)
|
|
Release signal for telegraph systems
|
|
US2599344A
(en)
|
|
Telegraph exchange for lines with simplex or duplex characteristics
|
|
US2761896A
(en)
|
|
Telegraph repeater system
|
|
US2337496A
(en)
|
|
Multiway regenerative repeater
|
|
US717776A
(en)
|
|
Quadruplex telegraph system.
|
|
US1891564A
(en)
|
|
Circuit arrangement for telegraphic apparatus
|
|
US313787A
(en)
|
|
Means for preventing |
|
US707557A
(en)
|
|
Telegraphic apparatus.
|
|
US366695A
(en)
|
|
Quadruplex telegraphy |
|
BE528427A
(cs)
|
|
|
|
US1242009A
(en)
|
|
Impulse-control system.
|
|
BE486685A
(cs)
|
|
|
|
US883530A
(en)
|
|
Telegraph-repeater.
|
|
US1220756A
(en)
|
|
Quadruplex telegraphy.
|
|
US2195973A
(en)
|
|
Start-stop repeater system
|
|
BE353046A
(cs)
|
|
|
|
US2194063A
(en)
|
|
Electrical signaling system
|
|
SU530659A3
(ru)
|
|
Устройство дл дистанционного выключени телетайпной абонентской установки
|
|
US1218413A
(en)
|
|
Quadruplex telegraphy.
|
|
GB373650A
(cs)
|
|
|
|
US1205248A
(en)
|
|
Printing-telegraph apparatus.
|
|
SU74607A1
(ru)
|
|
Устройство обратного управлени в системе магистральной св зи совещаний
|
|
US163923A
(en)
|
|
Improvement in duplex telegraphs |
|
US259106A
(en)
|
|
Duplex telegraph |