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Spring-Motor

Description: Patent for a spring motor for use in operating small devices such as churns.
Date: February 4, 1913
Creator: Dayton, William L.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Circuit-Closing Device for Doors.

Description: Patent for a device mounted within a door jamb that closes or breaks a circuit when the door is opened or closed, respectively. The electrical connection can be used to turn on lights when the door is opened and off when closed.
Date: November 4, 1913
Creator: Fitch, William Hubert
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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