4. Railway switches and signals
  5. Block-signal systems
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Electrical block separating joints for railway signaling systems

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

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Electrical detective circuits

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

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Electrical protective circuits

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

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Electronic code generating circuit for use in railroad...

Railway switches and signals – Block-signal systems – Automatic
Reexamination Certificate

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Electronic track current switching relay system

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

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