LEWIS, Circuit Judge.
Appellant as assignee of the inventors is the owner of Letters Patent (1,609,153) for an oil well plug, a device for shutting off the inflow of water at the bottom of the well. The application was made September 2, 1924, and the patent issued November 30, 1926. The specifications say this:
"Numerous means have been devised in an endeavor to accomplish this plugging in an efficient and pertinent manner. The device of our invention comprises...
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