This is a suit for infringement of two patents, Frantz, No. 2,589,794 (No. 794), a control valve for a diesel locomotive sanding system, which issued to Virgil L. Frantz on March 18, 1952 on an application filed January 16, 1947 and Frantz, No. 2,739,570 (No. 570), a bell ringer for diesel locomotives which issued March 27, 1956, on an application filed February 2, 1951.
Plaintiff Graham-White Manufacturing...
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