PER CURIAM.
This is an appeal from the dismissal by the United States District Court of a suit for patent infringement involving three patents owned by appellants, issued to Winter, namely: No. 2,509,661, issued May 30, 1950, on Rocker Arm Lubrication, referred to as the "notch" patent; No. 2,521,621, issued September 5, 1950, on Rocker Arm, referred to as the "covered channel" patent; and No. 2,522,326, issued September 12, 1950, on Rocker Arm for Internal-Combustion...
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