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Screw-Point for Well-Tubings.

Description: Patent for "a drill point for well tubing comprising a stock having a tapering point at one end and a coupling projection at its opposite end, said stock comprising a body having stepped portions of gradually increasing diameters upwardly, and a spiral cutting blade encircling said stepped portions,..." (lines 32-38).
Date: October 31, 1916
Creator: Wallace, John
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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