SANBORN, Circuit Judge.
This is an action brought by the appellants against the appellee for infringement of United States Letters Patent No. 2,740,379 for a farrowing pen. The patent was applied for by Robert A. Collins on August 20, 1954, and was issued to him on April 3, 1956. The Pigloo Corporation is his assignee. The questions raised by the pleadings were those usual in such cases, including the validity of the patent. The case was tried to Judge Graven, of...
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