00680cam a22002291 4500 po 29000247 DLC 20260227111858.0 810615s1850 maua 000 0 eng c po 29000247 (OCoLC)7502204 U.S. Patent Office Library ODaWU OCoLC DLC premarc TL544 .S544 Sheldon, William, -1871. Aerial navigation and the patent laws. By William Sheldon ... Boston, Thurston, Torrey, & Company, 1850. 46 p. illus., diagrs. 24 cm. Flight. Aeronautics. Patent laws and legislation. 51659 51659