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Feed-Screw for Rock-Drills.
Patent for "drills for the cutting or drilling of stone, and has for its primary object the taking up of wear in the worm-screws upon which such drills are usually mounted." (Lines 10-14) Includes instructions and illustrations.
Date:
March 3, 1896
Creator:
Keyser, William Almond
System:
The Portal to Texas History