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in subjects: "oil drilling"  
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Cutter for Rotary Boring-Drills.

Description: Patent for an improvement to Hughes' previously patented rotary cutter design for oil drilling equipment (no. 930,759, 1909), to increase the cutting surface area and durability of the cutter.
Date: June 15, 1915
Creator: Hughes, Howard R.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Sample-Taking Device.

Description: Patent for device which takes samples as the drill bit bores through the earth while drilling wells. The samples are used to determine presence or absence of oil and other minerals.
Date: August 7, 1917
Creator: Dodds, Redus D.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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