AKA, Paterson Twin-Tractor Biplane. Developed from the Gage-McClay Headless Pusher Biplane. Built by Paterson Aeroplane Company, San Francisco, CA by Charles H. Paterson, Roy Francis and Frank Bryant. Two were built, one for Bryrant and one for Francis. The one in this photo was the one built for Bryant.
Hall-Scott V-8 (either a 60 hp A-2 or a 80 hp A-3) with two chain-drive to propellers.
Smithsonian National Air and Space Museum (NASM 76-17854).