WOODBURY, Circuit Judge.
This is an appeal from a judgment dismissing a complaint alleging infringement of United States Patent No. 2,510,939 for a ruler construction, which issued on June 6, 1950, to Fred O. Carlson, assignor by mesne assignments to the plaintiff-appellant. The case was tried in the court below sitting without a jury during late January and early February, 1952; the judgment appealed from was entered on April 4, 1952, and this appeal was argued on...
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