SOPER, Circuit Judge.
Sanford Investment Company, Inc., and Sanford-Day Iron Works, Inc., owner and licensee respectively of patent No. 1,809,707, relating to an improvement in mine cars, brought this suit in the District Court of the United States for the Southern District of West Virginia, against the Crab Orchard Improvement Company for infringement of claims 3, 7, 9 and 15 of the patent. The improvement claimed in the patent is a hinged front end-gate which is...
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