Feb 14, 2018
Victor J. Evans & Co., “Certificate of Patentability” (c. 1900)
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Victor J. Evans & Co., “Certificate of Patentability” (c. 1900)
U.S. Patent Office, Washington, D.C. (c. 1906)
U.S. Patent Office, Washington, D.C.
Old Patent Office, F St. Facade, Washington, D.C. (c. 1846).