Cross-Roller Bit.
Description:
Patent for a certain new and useful improvement in cross-roller bits. Invention relates to "improvements in rotary boring drills for use in drilling wells for water, oil or gas and has particular reference to drills of the so called cross roller type for use in hard formation."
Date:
November 4, 1919
Creator:
Hughes, Howard R.
Item Type:
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Partner:
UNT Libraries Government Documents Department