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in creator/contributor: "Ackman, George, Jr."  
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Well-Liner Clamp.

Description: Patent for a well-liner clamp for oil, gas, and other similar wells that prevents the well from caving in. The well-liner clamp is made of resilient material to hold in place, contracts while being placed into the well, and can be released after being placed into the well to expand to fit the walls of the well.
Date: May 31, 1921
Creator: Bigelow, Robert J.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Puzzle.

Description: Patent for a puzzle made of interlocking blocks that are attached by a cord through holes in the blocks, that, when fully assembled, forms the shape of a Chinese cross.
Date: August 23, 1921
Creator: Hime, Clint T.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Attachment for Tractors.

Description: Patent for attachments in tractors. "This invention relates to tractors and has for its object the provision of means where by when the front axle and wheels of the tractor rise caused by rearing of the tractor, the clutch will be automatically disconnected and remain so until the front wheels of the tractor descend again into engagement with the ground. An important and more specific object is the provision in a tractor of a front axle formed n sections pivotally connected, one section being c… more
Date: August 30, 1921
Creator: Cholick, Joseph John
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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