4. Railway switches and signals
  5. Train dispatching
  6. Train telegraphy or telephony
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Communication system for guideway operated vehicles

Railway switches and signals – Train dispatching – Train telegraphy or telephony
Patent

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Coupling for inducing a current in the rails of a railroad track

Railway switches and signals – Train dispatching – Train telegraphy or telephony
Patent

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Selective data transmission process and device for...

Railway switches and signals – Train dispatching – Train telegraphy or telephony
Reexamination Certificate

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System for transmitting broadband data and/or instructions betwe

Railway switches and signals – Train dispatching – Train telegraphy or telephony
Patent

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