KNOCH, Circuit Judge.
The plaintiff-appellant, Elbert C. Leach, who is the present owner of the patent in suit, patent No. 2,580,306 (issued in 1951 on application made in 1945) brought this action for infringement against the defendants-appellees Badger Northland, Inc., and M-F Badger Corporation.
The District Court found the claims invalid and not infringed, and this appeal followed. The appellant is pursuing claims numbered 12, 15 and 16
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