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Core Lifter For Diamond Drills

Description: Patent for a core lifter for diamond drills. Illustration included.
Date: January 10, 1905
Creator: Dupuis, David & Carpenter, D. A.
Partner: UNT Libraries Government Documents Department

Piano-Hammer.

Description: Patent for a piano hammer, which has a strip of striking material that can be moved over to a new section when one section wears out, to increase the life of the hammer.
Date: May 24, 1910
Creator: Young, Henry E.
Partner: UNT Libraries Government Documents Department
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