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WO1989006083A1
(en)
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Data transmission system
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BE424095A
(forum.php)
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US2652446A
(en)
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Release signal for telegraph systems
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US2599344A
(en)
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Telegraph exchange for lines with simplex or duplex characteristics
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US2761896A
(en)
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Telegraph repeater system
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US2337496A
(en)
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Multiway regenerative repeater
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US717776A
(en)
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Quadruplex telegraph system.
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US1891564A
(en)
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Circuit arrangement for telegraphic apparatus
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US313787A
(en)
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Means for preventing |
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US707557A
(en)
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Telegraphic apparatus.
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US2350589A
(en)
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Telephone or like system
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US366695A
(en)
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Quadruplex telegraphy |
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BE528427A
(forum.php)
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US1242009A
(en)
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Impulse-control system.
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BE486685A
(forum.php)
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US883530A
(en)
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Telegraph-repeater.
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US1220756A
(en)
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Quadruplex telegraphy.
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US2195973A
(en)
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Start-stop repeater system
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BE353046A
(forum.php)
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US1470984A
(en)
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Signaling circuits |
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US2194063A
(en)
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Electrical signaling system
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SU530659A3
(ru)
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Устройство дл дистанционного выключени телетайпной абонентской установки
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GB373650A
(forum.php)
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US1205248A
(en)
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Printing-telegraph apparatus.
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SU74607A1
(ru)
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Устройство обратного управлени в системе магистральной св зи совещаний
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