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Door Controlled Electric Switch

Description: Patent for an improved switch attachment that will allow a room, vault, or compartment to be kept lighted when door is open or closed, but may also be shut off when leaving the room.
Date: October 17, 1916
Creator: Kreter, Otto
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Ball-Bearing.

Description: Patent for a new and useful ball bearing, including instructions and illustrations.
Date: October 17, 1899
Creator: Millen, George
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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