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Swivel for Rotary Drills

Description: Patent for a swivel for rotary drills used for wells of oil, water, and gas. This swivel ensures no substances, such as sand, get into the parts of the drill that move.
Date: October 5, 1920
Creator: Humason, Granville A.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Cotton-Chopper

Description: Patent for a cotton-chopper with two moveable, adjustable cutting apparatuses, which is operated using the foot. One of the cutters moves along the path of travel of the device and the other is stationary, as to prevent the chopper from pulling the cotton plant from the ground while cutting. Patent includes illustrations.
Date: October 5, 1920
Creator: Dawson, William L.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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