HARTIGAN, Circuit Judge.
This is an appeal from a judgment of the United States District Court for the District of Massachusetts, entered on January 22, 1957, holding plaintiffs' Letters Patent No. 2,667,653 valid and infringed.
The facts, as disclosed by the record and the opinion of the district court, are substantially as follows.
The patent in suit, No. 2,667,653, for Combined Mop and Wringer, was issued on February 2, 1954, to plaintiff-appellee...
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