WILBUR, Circuit Judge.
This is an appeal from a final decree of the District Court holding that appellees have not infringed patent No. 1,844,354 for an expanding well reamer granted to appellant February 9, 1932.
The patented device is primarily for use in rotary oil well drilling. In drilling an oil well the casing is lowered into the well as the drilling progresses to prevent the walls of the well from caving into the bored hole. Further drilling operations...
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