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SE185951C1
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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NO123843B
(GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
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US2664459A
(en)
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Automatic switching means for use in telegraph systems and the like
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GB583027A
(en)
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Improvements in circuit arrangements for receiving electrical pulse signals
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US1541386A
(en)
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Machine-switching telephone-exchange system
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US2303356A
(en)
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Selecting system
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DE709424C
(de)
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Nach dem Fuenferalphabet oder einem aehnlichen Alphabet arbeitende Fernsteuerungs- oder Drucktelegraphenanlage unter Benutzung eines Relaiswaehlers
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US1805114A
(en)
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Printing telegraph receiver
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US3066191A
(en)
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Automatic telecommunication exchange
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US2047091A
(en)
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Double current telegraph installation
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US2071078A
(en)
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Signaling system
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US2634403A
(en)
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Control and marking circuits for adding-type impulse counters
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DE740114C
(de)
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Einrichtung zur UEberwachung von telegrafischen Verbindungen in Telegrafenvermittlungsanlagen
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US2251666A
(en)
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Impulse sender
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US917011A
(en)
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Printing-telegraph.
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SU875646A1
(ru)
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Коммутатор сигналов с пам тью
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US1810004A
(en)
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Voice operated relay circuits
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US1139906A
(en)
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Telephone-exchange system.
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SU42588A1
(ru)
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Буквопечатающий телеграфный аппарат
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US3536847A
(en)
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Crosspoint operating circuit
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US2692378A
(en)
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Space reservation
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US1199338A
(en)
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Telegraph system.
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SU1704216A1
(ru)
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Устройство дл защиты от перенапр жений в трехфазной сети с изолированной нейтралью измерительного трансформатора напр жени
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SU40823A1
(ru)
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Электрическое соединительное устройство
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US1542361A
(en)
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Interconnection of electrical lines
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