4. Railway switches and signals
  5. Signals
  6. Roadway, visual, and portable
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Cantilever arm signal assembly

Railway switches and signals – Signals – Roadway – visual – and portable
Patent

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Flagging apparatus and method

Railway switches and signals – Signals – Roadway – visual – and portable
Patent

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Railway indicator device and method

Railway switches and signals – Signals – Roadway – visual – and portable
Reexamination Certificate

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