GRUBB, District Judge.
This is an appeal from a final decree of the District Court of the United States for the Eastern District of Louisiana, holding claim 4 of the Henderson patent, No. 1,422,202, for improvements in dry kiln, not infringed by the dry kiln structure of the appellee, the Welch Dry Kiln Company, and dismissing the appellants' bill of complaint. The appellee (defendant) denied infringement, alleged invalidity, and pleaded estoppel by conduct in bar...
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