Locke and Dosch, the appellees, filed their application for a patent on improvements in lubricating apparatus, September 20, 1920. On April 18, 1922, the appellant, Gleason, filed his application covering the same subject-matter, and a patent was issued to him, Serial No. 1,553,768, on September 15, 1925. Thereafter, on November 17, 1925, the appellees copied claims 1, 3, and 7 of appellant's patent...
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