4. Railway switches and signals
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N-aralkyl-piperidine-methanol derivatives

Railway switches and signals – Electric actuation – Motor systems
Patent

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Noise cancellation in railway cab signal

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

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Non contact isolated current detector

Railway switches and signals – Train-position indication – Miniature model
Patent

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Non-hazardous third rail energizing warning device

Railway switches and signals – Miscellaneous – Signals and indicators
Patent

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Non-linear filter

Railway switches and signals – Cab signal or train control – Speed-control systems
Patent

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Non-powered trailed switch detector for railroad track...

Railway switches and signals – Electric actuation – Switch signals
Reexamination Certificate

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Non-powered trailed switch detector for railroad track...

Railway switches and signals – Electric actuation – Switch signals
Reexamination Certificate

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