MR. JUSTICE BLACK delivered the opinion of the Court.
Claiming he was the original and sole inventor of a mechanical device, the respondent Kepner asked the United States Patent Office for a patent. Later the petitioner Sanford filed a similar application making the same claim. As authorized by R. S. § 4904, 35 U. S. C. § 52, the Commissioner of Patents directed a board of interference examiners to hold hearings and determine the
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