WILLIAM E. DOYLE, Circuit Judge.
This appeal, by the plaintiff in the district court, involves a patent infringement action pertaining to Claim 6 of U.S. Patent No. 2,674,957, which was issued April 13, 1954. It pertains to the combination of front and rear wheel axle assemblies on a roller coaster type of amusement car which are designed so as to insure that the car will remain on the track at relatively high speeds while executing sharp substantially banked curves...
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