New Wing, Patent Office, Washington, D.C., U.S.A.

Interior of Patent Office, Washington, D.C., U.S.A.

Interior of Patent Office, Washington, D.C..

Model Room, in the U.S. Patent Office.

U.S. Patent Office, Washington, D.C., after the Doric Style of Architecture.

U.S. Patent Office, Washington, D.C. after the Doric Style of Architecture.

U.S. Patent Office, Washington, D.C.

Corridor in U.S. Patent Office.

Blue Corridor in the U.S. Patent Office.

Corridor in U.S. Patent Office.

Blue Corridor, in the U.S. Patent Office.

The Blue Corridor in the U.S. Patent Office.

Model Room, in the U.S. Patent Office.

Blue Corridor in the U.S. Patent Office.

Corridor in U.S. Patent Office.

Model Room, Patent Office.

Model Room of Patent Office.

Model Room of Patent Office.

Interior. U.S. Patent Office.

Interior view. Patent Office.

Interior view. Patent Office.

South Hall of Patent Office.

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

Model Room of the U.S. Patent Office.

Patent Office Corridor.

Patent Office Corridor.

The Patent Office - Washington.

Patent Office. Interior.

Patent Office, U.S.

Patent Office, Washington.