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in subjects: "Science and Technology"  
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Tool-Joint.

Description: Patent for improvements in a tool joint that has been adapted to connect sections of a drill used in drilling wells.
Date: June 29, 1920
Creator: Stafford, George A. & Stafford, Roy M.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Fire-Extinguishing Device.

Description: Patent for fire extinguishing devices to "supplying steam to the fluid so that oxygen sufficient to support combustion will not reach the flame" (lines 14-16).
Date: July 6, 1920
Creator: Byrd, Williman Harvey
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Pipe-Puller.

Description: Patent for improvements in pipe pullers that grips the pipe and cuts the same time it is pulled.
Date: June 20, 1920
Creator: Robichaux, Sosthene & Paggi, Charles
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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