4. Railway switches and signals
  5. Electric automatic highway signals, mine doors, and gates
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Gate monitoring system

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

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Grade crossing assembly

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

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Grade-crossing motorist warning system

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

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