McCORD, Circuit Judge.
Jesse E. Hall, on November 5, 1940, was issued Letters Patent 2,220,237 on application Serial No. 119,246, filed January 6, 1937, for a device used to clean the walls of oil wells. The function of the device, or centralizer, is to clean from the walls of oil wells mud and other irregularities, and to condition the walls by exposing the formation, to the end that a better bond may be had with cement when it is placed around the casing. The device...
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