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Design for Cam Wheel.

Description: Patent for A Cam-Wheel that has opposite reversely disposed duplicate lobes of segmental form.
Date: March 8, 1898
Creator: Wheeler, Andrew Jackson
Partner: UNT Libraries Government Documents Department

Ant-Trap.

Description: Patent for a new type of ant trap that captures ants by having them crawl up a wooden central chamber and then fall into a sheer metal pit. Includes illustrations.
Date: December 8, 1891
Creator: Walker, Stephen A.
Partner: UNT Libraries Government Documents Department
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