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ES29021A1
(en)
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A system of telegraph and telephone transmissions by triple derivation.
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DK4097C
(en)
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Automatic Receiver for Morse code both by Single and Multiplex Telegraphy at intervals and at the same time Telegraphing in opposite directions.
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ES28388A1
(en)
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A transmission system for telegraph and telephone signals.
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FR329539A
(en)
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Telegraph transmitter
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FR359096A
(en)
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Transmitter for automatic telegraph systems
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DK6225C
(en)
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Receiver device for submarine sound transmission.
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CA90410A
(en)
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Telegraphic transmitter
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CH25341A
(en)
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Support for telegraph lines, power transmission lines, etc.
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DK3629C
(en)
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Telegraph.
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ES36335A1
(en)
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A system of multiple telegraph transmissions.
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FR339988A
(en)
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Telegraph transmitter
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CA84715A
(en)
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Telegraph transmitter
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CH28847A
(en)
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Telegraph transmitter
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DK3718C
(en)
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Automatic Letter Writing Telegraph.
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DK7454C
(en)
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Keypad for Telegraphing Morse code and similar writing.
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DK3855C
(en)
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Procedure for Making Kalomel.
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FR370115A
(en)
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Receiver for telegraphic transmissions
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DK7552C
(en)
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Devices of telegraph transmitter apparatus.
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DK10261C
(en)
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Devices for Sending or Receiving Signals.
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CA90409A
(en)
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Telegraph transmitter
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CA88461A
(en)
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Telegraph transmitter
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DK5967C
(en)
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Receiver device for wireless Telegraphs.
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ES20530A1
(en)
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An automatic transmitter.
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DK3670C
(en)
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Procedure for Making Paper for Secret Messages.
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DK4565C
(en)
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Devices at Perforators for the Paper Strips of Automatic Telegraph Transmitters.
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