Période

7 résultats pour : archival u.s. patent office

  • Page
  • sur
  • 1
Connectez-vous pour plus de résultats
United States Patent Office
UMG22A23_015

United States Patent Office

Patent Office exterior, [Washington, D.C.] ca. between 1910 and 1935
UMG22A10_448

Patent Office exterior, [Washington, D.C.] ca. be...

Stacks of documents in Patent Office, Washington, D.C. ca. 1909
UMG22A13_358

Stacks of documents in Patent Office, Washington, ...

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...

Patent Office employee pointing to copies of first patent granted after 1836 when patent laws were rewritten circa 1940.
UMG21A22_023

Patent Office employee pointing to copies of first...