4. Railway switches and signals
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Energy absorbing impact barrier

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

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Enhanced distributed power

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

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Ergonomic hand throw arm for railroad switch mechanism

Railway switches and signals – Switch stands – Structural types
Reexamination Certificate

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Extensible railroad grade crossing gate arm

Railway switches and signals – Electric automatic highway signals – mine doors – and gates
Patent

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