Graflex and Graphic Focal Plane Shutter Photography, Folmer & Schwing Department, Eastman Kodak Co. (Rochester, NY), undated c. 1925, ~5 ½"x8 ½", 40pp
Concurrent with printed catalogs, the Folmer & Schwing Department printed manuals such as this one. It was purchased with a Graflex catalog dated 1927, so it is probably near the same age. Folmer & Schwing Department re-organized in 1926 to the Folmer Graflex Corporation. This manual must have been printed prior to 1926 since it is still marked F & S Department, so is estimated to be c. 1925.