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Patent Office

SI

Patent Office

Bell & Brother, active 1865 - 1875

c. 1860

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U.S. Patent Office

U.S. Patent Office

Corridor in U.S. Patent-Office

Corridor in U.S. Patent-Office

Patent Office

Patent Office

Patent Office

Patent Office

Model Room

Model Room

U.S. Patent Office

U.S. Patent Office

Patent Office

Patent Office

St. James (Jacob)

St. James (Jacob)

Patent Office, Washington DC

Patent Office, Washington DC

New Wing, Patent Office, Washington, D.C.

New Wing, Patent Office, Washington, D.C.