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in subjects: "safety features"  
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Safety-Elevator.

Description: Patent for a elevator with a safety feature to prevent the car from falling rapidly to the bottom of the shaft if a cable breaks.
Date: March 8, 1910
Creator: Dunlap, Henry William & Lumbley, Joseph Slater
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Train-Order Signal.

Description: Patent for a train order signal, which prevents accidental clear signals from the semaphores by requiring the train order pad to be replaced before a signal can be given.
Date: May 18, 1909
Creator: Gates, William T.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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