4. Railway switches and signals
  5. Electric automatic highway signals, mine doors, and gates
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Computer for motion sensing device setup

Railway switches and signals – Electric automatic highway signals – mine doors – and gates – Normally open track circuit
Patent

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Crossing gate

Railway switches and signals – Electric automatic highway signals – mine doors – and gates
Patent

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Crossing gate counterweight adjustment

Railway switches and signals – Electric automatic highway signals – mine doors – and gates
Patent

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