Vintage AIR CHIEF models 4-A-21 (Code 5-59001A) and 4-A-22 (Code 5-5-9001B) 6 tube, 2 band Superheterodyne AM SW radio receiver. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test chart, repair parts list and description. 6 pages. Dated 1947. Firestone Tire and Rubber Company of Akron, OH. This manual would make a sensational accompaniment to your classic radio equipment.