GARRETT, Associate Judge.
This is a three-party interference proceeding involving alleged "useful improvements in grinding machines," being machines particularly for the grinding of internal surfaces.
On February 3, 1921, appellant filed an application in the Patent Office seeking a patent, which was granted April 28, 1925, being No. 1,535,331, and on January 20, 1926, he filed an application for a reissue of No. 1,535,331, presenting therein claims corresponding...
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