4. Telegraphy
  5. Repeaters
  6. Automatic in either direction
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Selection of branch lines of multipoint junction circuits

Telegraphy – Repeaters – Automatic in either direction
Patent

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Self-contained bidirectional amplifying repeater

Telegraphy – Repeaters – Automatic in either direction
Patent

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Signaling unit for interchange of data with multipoint line sele

Telegraphy – Repeaters – Automatic in either direction
Patent

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