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Circuit-Closing Device for Doors.
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
System:
The Portal to Texas History
Spring-Motor
Patent for a spring motor for use in operating small devices such as churns.
Date:
February 4, 1913
Creator:
Dayton, William L.
System:
The Portal to Texas History