US1040940A
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Art of railway signaling.
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US1040941A
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Circuit-closing device or switch for use in connection with electric or other railways.
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US1049636A
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Electric-circuit controller.
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CA116017A
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Semaphore
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US856506A
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Railway semaphore-signal.
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US874477A
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Railway-signal.
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US908189A
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Railway-signal.
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US829309A
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Automatic railway block-signal.
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US852094A
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Railway semaphore-signal.
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US852092A
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Electrically-controlled semaphore-signal.
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US852093A
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Railway semaphore-signal.
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US829311A
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Railway semaphore-signal.
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US829310A
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Spectacle-frame for semaphore-signals.
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US829905A
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Electrical relay.
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