Vintage FIRESTONE model 4-C-13 (Code: 332-8-140623) portable 5 tube Superheterodyne AM radio receiver.  Original old Sams Photofact manual includes schematic, layouts, alignment info, voltage test chart,  repair parts list. 4 pages. Dated 1949.  Firestone Tire and Rubber Company of Akron, OH.  This manual would make a sensational accompaniment to your vintage audio equipment.