The History of 35mm Film
In 1916, a very small box camera named the No. 00 Cartridge Premo camera was introduced using a No.35 roll film. This was numbered differently as it was not the same as the Eastman Non-Curling film supplied in the other roll film sizes but was apparently made from unperforated 35mm motion-picture film. In 1934 when 35mm film in cartridges were introduced with the Kodak Retina camera, number 135 was assigned to this product. This film size could also be used in the Contax and Leica cameras. Daylight-loading spools of film for these two cameras were also offered, and were numbered 235 and 435. In July 1952, a special length of film for 20 pairs of pictures made with 35mm stereo cameras was introduced and designated as 335.