Roll film of Peter's camera. David Henderson Houston (born June 14, 1841; died May 6, 1906), originally from Cambria, Wisconsin, patented the first holders for flexible roll film. Houston moved to Hunter in Dakota Territory in 1880. He was issued an 1881 patent for a roll film holder which he licensed to George Eastman (it was used in Eastman's Kodak 1888 box camera). Houston sold the patent (and an 1886 revision) outright to Eastman for $5000 in 1889. Houston continued developing the camera, creating 21 patents for cameras or camera parts between 1881 and 1902. In 1912 his estate transferred the remainder
Mitchell Camera effects process plates, or for high-speed filming. In a few cases, the U.S.S.R. added spinning mirror-shutter reflex focusing and viewing, thereby deleting the Mitchell-designed rackover focusing mechanism and the Mitchell-designed side viewer. Though the Eastern Bloc standard for camera film is Kodak Standard perforations, that standard was rejected by the very Bloc which proposed it. U.S.S.R. professional cameras consequently require film stocks that are incompatible with Western Bloc camera film, which always uses Bell & Howell perforations. Eastern Bloc (KS) camera film "will" pass undamaged through a Western Bloc (BH) professional camera, but the images "will not" be registered accurately.