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Automatic Gas-Release Packer.

Description: Patent for automatic gas release packer that uses constant pressure regulated by spring-controlled valves for better control when lifting oil out of wells.
Date: April 11, 1922
Creator: Cummings, William J.
Partner: UNT Libraries Government Documents Department

Grapple.

Description: Patent for improving grapples for regaining tools, particularly those that can be hidden and submerged.
Date: April 26, 1921
Creator: Ginter, James. C.
Partner: UNT Libraries Government Documents Department

Churn.

Description: Patent for a churn with a construction which will prevent "access of objectionable matter to the churn-body" (lines 14-15) including instructions and illustrations.
Date: April 3, 1900
Creator: Hargrove, Kincheon W.
Partner: UNT Libraries Government Documents Department
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