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Combination Drill Bit and Drill Shank

Patent for "Improvements in Combination Drill-Bits and Drill-Shanks" (lines 6-7) including illustrations.

Date: December 30, 1919

Creator: Humason, Granville A.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

Drill-Bit.

Patent for improvement to drill-bits. The object of the invention is to provide a bit of the character described which is especially adapted for deep well drilling by the rotary process.

Date: December 30, 1919

Creator: Humason, Granville A.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

Pipe-Wrench.

Patent for improvements to pipe wrenches to a more simple design.

Date: February 16, 1915

Creator: Lewis, Guy V.

Item Type: Patent

Partner: UNT Libraries Government Documents Department

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