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Tool Joint.

Description: Patent for a screw-threaded tool joint used for drill pipes on rotary drilling rigs.
Date: August 10, 1920
Creator: Lyle, Henry Claude
Partner: UNT Libraries Government Documents Department

Rotary Drilling-Machine

Description: Patent for rotary well drilling platform improvements. The improvements are to control how the turntable moves without having to change the structure of the platform or having a second person watching while drilling.
Date: May 25, 1920
Creator: Black, Lee Jackson
Partner: UNT Libraries Government Documents Department

Rotary Drilling-Machine.

Description: Patent for well drilling rigs also known as rotaries that provides a new way for controlling the slips that eliminates all danger of injury to workers.
Date: June 1, 1920
Creator: Black, Lee J.
Partner: UNT Libraries Government Documents Department

Float-Controlled Liquid-Gaging and Cut-Off Means.

Description: Patent for an automatic cut off device for oil tanks that indicates the amount of water in an oil tank and will automatically close the discharge opening when all the water has been discarded from the tank.
Date: June 29, 1920
Creator: Waldrep, Granville J.
Partner: UNT Libraries Government Documents Department

Burner.

Description: Patent for improvements in burners to allow them to use liquid fuel such as oil.
Date: June 1, 1920
Creator: Placette, Joeseph G.
Partner: UNT Libraries Government Documents Department
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