Rotary Boring-Drill.
Description:
Patent for a rotary boring drill that will "provide a cutting surface for the cutter" (lines 20-21) for drilling wells, particularly "roller cutters of the cone type used in drilling rock of other hard formation." (lines 13-15)
Date:
December 23, 1919
Creator:
Hughes, Howard R.
Partner:
UNT Libraries Government Documents Department