4. Railway switches and signals
  5. Block-signal systems
  6. Automatic

Willard L. Geiger

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Railroad motion detecting and signalling system with repeater re

Railway switches and signals – Block-signal systems – Automatic
Patent

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Railway signal system

Railway switches and signals – Block-signal systems – Automatic
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Train approach detector

Railway switches and signals – Electric automatic highway signals – mine doors – and gates – Normally closed track circuit
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Variable high pass coupler

Railway switches and signals – Block-signal systems – Automatic
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Profile ID: LFUS-PAI-P-340225

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