A self-propelled, lighter-than-air aircraft with means of controlling the direction of flight.
Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)
2400×1551, 542.4 KiB
1024×661, 110.2 KiB
640×413, 56.4 KiB
320×206, 20.3 KiB