4. Railway switches and signals
  5. Roadway-defect protection
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Rail guard

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

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Railroad track alarm

Railway switches and signals – Roadway-defect protection
Patent

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Railroad track simulator for assessing track signal susceptibili

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

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Railway hazard acoustic sensing, locating, and alarm system

Railway switches and signals – Roadway-defect protection
Reexamination Certificate

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Railway structure hazard predictor

Railway switches and signals – Roadway-defect protection
Patent

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Railway train signalling system for remotely operating warning d

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

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