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Piano-Hammer.
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.
System:
The Portal to Texas History
Core Lifter For Diamond Drills
Patent for a core lifter for diamond drills. Illustration included.
Date:
January 10, 1905
Creator:
Dupuis, David & Carpenter, D. A.
System:
The Portal to Texas History