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Workers at the U.S. Patent Office, [Washington, D.C.] ca. between 1918 and 1928
UMG22A13_202

Workers at the U.S. Patent Office, [Washington, D....

United States Patent office workers looking through collection of over 2,000,000 patents circa 1940 .
UMG21A22_025

United States Patent office workers looking throug...

Employees in the patent office file room circa 1940.
UMG21A22_024

Employees in the patent office file room circa 194...