http://www.rssboard.org/rss-specification 720 http://catalog.wrhs.org/collections/search?docsPerPage%3D100;f1-subject%3DAutomobiles%20--%20Patents.;smode%3Dsimple;subject%3DPatents%20--%20United%20States;subject-join%3Dexact Results for your query: docsPerPage=100;f1-subject=Automobiles -- Patents.;smode=simple;subject=Patents -- United States;subject-join=exact Tue, 28 Jul 2020 12:00:00 GMT http://catalog.wrhs.org/collections/view?docId=ead/MS4671.xml The George Washington patent letter may be the earliest patent issued in the United States for a self-propelled vehicle or "horseless carriage." Purchased by Frederick C. Crawford in 1951, research done at that time indicates that although this patent is listed in early patent indexes, the U.S. Patent Office has no copies of it, and no models or drawings of this invention were found. The patent certification of delivery, acceptance, and payment of application fees is signed "G. Washington by the President Edm. Randolph", with the seal of the United States affixed. http://catalog.wrhs.org/collections/view?docId=ead/MS4671.xml Wed, 01 Jan 2014 12:00:00 GMT