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

Dick J. Kolkman

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Fail-safe time delay circuit

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

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Fail-safe voltage-limiting circuit for an audio frequency overla

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

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Transfer apparatus for energy sources

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

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Two-wire signal transmitter and method for maintaining integrity

Communications: electrical – Systems – Selsyn type
Patent

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Vital inverter driver

Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent

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Profile ID: LFUS-PAI-P-222188

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