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
Kodak Retina Dr. August Nagel - Fabrik fuer Feinmechanik Werk in Stuttgart-Wangen to Kodak AG in December 1931, the new firm was designated "Kodak AG - Dr. Nagel Werk". Nagel continued to innovate including developing the Retina folding cameras around the new Kodak 135 preloaded 35mm cartridge. Prior to this, most 35mm film was loaded by the user into proprietary cartridges in a darkroom or light-tight bag. In the early 1930s August Nagel was developing a 35mm camera and a preloaded disposable 35mm film cartridge, which would also fit in Leica and Contax cameras. Nagel was an expert in miniature cameras; his