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Mechanism for Rotating Earth-Drill Bits.
Patent for a mechanism for rotating earth-drill bits that introduces an up and down motion.
Date:
October 7, 1919
Creator:
Nippert, Worley
System:
The Portal to Texas History
Automobile Jack
Patent for Automobile Jack
Date:
November 7, 1916
Creator:
Taylor, Alva R.
System:
The Portal to Texas History