4. Railway switches and signals
  5. Electric automatic highway signals, mine doors, and gates
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Highway crossing control system for railroads utilizing a commun

Railway switches and signals – Electric automatic highway signals – mine doors – and gates – Car-actuated controller
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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Highway-rail grade crossing controller with out of service mode

Railway switches and signals – Electric automatic highway signals – mine doors – and gates
Reexamination Certificate

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