4. Railway switches and signals
  5. Block-signal systems
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Alternating current track circuits

Railway switches and signals – Block-signal systems – Automatic
Patent

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Antenna apparatus for vehicle track rail signals

Railway switches and signals – Block-signal systems – Automatic
Patent

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Antenna apparatus for vehicle track rail signals

Railway switches and signals – Block-signal systems – Automatic
Patent

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Apparatus for improved block control of train operation

Railway switches and signals – Block-signal systems – Semi-automatic
Patent

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Arrangement for positively determining the actual sounding of a

Railway switches and signals – Block-signal systems – Recorders
Patent

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Arrangement for protecting data communication in a continuous au

Railway switches and signals – Block-signal systems – Automatic
Patent

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Audio frequency track circuit for rapid transit applications wit

Railway switches and signals – Block-signal systems – Automatic
Patent

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Audiofrequency track circuit with data transmission (digital TC)

Railway switches and signals – Block-signal systems – Automatic
Patent

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Automatic and guided system for transporting people and...

Railway switches and signals – Block-signal systems
Reexamination Certificate

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