Vintage G & M EQUIPMENT model Guardian Mark 1 6 tube Superheterodyne AM radio receiver. intercommunication intercom system and fire alarm. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test chart, repair parts list and description. 5 pages. Dated 1956.  G & M Equipment Co., of N. Hollywood, CA. This manual would make a sensational accompaniment to your classic radio equipment.