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

Donald E. Stark

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Broken rail detecting track circuits

Electricity: electrical systems and devices – Control circuits for electromagnetic devices – For relays or solenoids
Patent

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Phase selective track circuit apparatus

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

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Shotgun barrel

Arms – pyrotechnics – hunting and fishing equipment – Fishing equipment – Net or scoop
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Profile ID: LFUS-PAI-P-211912

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