HICKS, Chief Judge.
Plaintiff-appellee brought suit against defendants-appellants for infringement of his Patent No. 2,238,306, issued April 15, 1941, for a "Curb Feeler For Automobiles." The principal defense was non-invention. Infringement is conceded if the patent should be held valid.
The District Court decided that the patent was valid and infringed.
The patent is not a primary one. The specification states that its object is to provide certain...
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