4. Railway switches and signals
  5. Electric automatic highway signals, mine doors, and gates
  6. Normally open track circuit
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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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Highway crossing system with improved ring sustain feature

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

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Highway crossing system with motion detecting apparatus

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

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Multiplexing means for motion detectors at grade crossings

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

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Railroad grade crossing constant warning protection system

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

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System controlling apparatus which compares signals from sensors

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

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