Triacetate was then produced and is still in production for roll film today. Both use 120 or 220 roll film. A roll film camera would also facilitate house calls. Three more orders for roll film were placed over the next five months. This model also allowed the simple conversion from 120 roll film to 220 roll film. The first rock and roll film came out the following year. The 120 roll film Rolleiflex series is marketed primarily to professional photographers. The opaque backing paper allows roll film to be loaded in daylight. The first transparent plastic roll film followed in 1889. Medford appeared in the Warner Bros. rock and roll film, "Jamboree" (1957). The typical TLR is medium format, using 120 roll film with square images. Similar technology FP shutters were also common in medium format 120 roll film cameras. Roll film is developed, fixed and washed by continuous processors. Moreover, roll film was much easier to archive than glass plates. In 1881 a farmer in Cambria, Wisconsin, Peter Houston, invented the first roll film camera.