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BE424095A
(enrdf_load_html_response)
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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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BE528427A
(enrdf_load_html_response)
|
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US1242009A
(en)
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Impulse-control system.
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BE486685A
(enrdf_load_html_response)
|
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US883530A
(en)
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Telegraph-repeater.
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US2195973A
(en)
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Start-stop repeater system
|
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US1470984A
(en)
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Signaling circuits |
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US270990A
(en)
|
|
Multiplex telegraphy |
|
US2194063A
(en)
|
|
Electrical signaling system
|
|
SU530659A3
(ru)
|
|
Устройство дл дистанционного выключени телетайпной абонентской установки
|
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GB373650A
(enrdf_load_html_response)
|
|
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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 |
|
US316956A
(en)
|
|
gabdanieb |