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Roller Boring-Drill.

Description: Patent for a roller boring-drill with improved arrangement of cutters on the head, and formation of teeth on the cutters. This new head design is better for drilling formations that are not brittle.
Date: August 23, 1921
Creator: Fletcher, Harold W.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Drill-Support.

Description: Patent for "new and useful Improvements in Drill-Supports, of which the following is a specification. This invention relates to drilling apparatus, and more particularly to an apparatus of this character for use in coal or other mines for boring or drilling holes for blasting charges and other purposes" (lines 6-13).
Date: November 23, 1915
Creator: Williams, Benjamin F. & Mayfield, James W.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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