Patent pending models of invention are displayed in an exhibition in Washington DC.
Washington DC USA Date:1986, July 10 Duration:2 min 45 sec Sound:Yes
A patent pending model exhibit in Washington DC. Views of the U.S. Capitol. People walk at a footpath along shops. Patent pending models of invention are displayed. These objects include carding machines, a sewing machine, an improved adding machine, an improved windmill and a sail boat. Men and woman speak during the exhibition.
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