4. Railway switches and signals
  5. Roadway-defect protection
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Method and apparatus for detecting railway activity

Railway switches and signals – Roadway-defect protection – Electric
Patent

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Method and system for a track signaling system without...

Railway switches and signals – Roadway-defect protection – Electric
Reexamination Certificate

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Method and system for automated fault reporting

Railway switches and signals – Roadway-defect protection – Electric
Reexamination Certificate

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