4. Railway switches and signals
  5. Electric automatic highway signals, mine doors, and gates
  6. Car-actuated controller

Comstock Group, Inc.

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Emergency roadside telephone communications system

Telephonic communications – Having light wave or ultrasonic link for speech or paging... – Including fiber optic link within telephone network
Patent

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Railroad signal system

Railway switches and signals – Electric automatic highway signals – mine doors – and gates – Car-actuated controller
Patent

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