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Patent Office

SI

Patent Office

Bell & Brother, active 1865 - 1875

c. 1870

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U.S. Patent Office

U.S. Patent Office

Patent Office

Patent Office

Patent Office

Patent Office

U.S. Patent Office

U.S. Patent Office

Model Room

Model Room

Corridor in U.S. Patent-Office

Corridor in U.S. Patent-Office

Patent Office

Patent Office

St. Matthew

St. Matthew

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

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

Patent Office, Washington DC

Patent Office, Washington DC