Vintage Service Manual - GODFREY model 6AD 3-tube office inter-communication intercom system. Manufactured by Godfrey Manufacturing Company, of Milwaukee, WI. Dated 1947. 4 pages. Original old Sams Photofact manual includes schematic, layout, alignment instructions, voltage & resistance test chart, repair parts list and description. This manual would make a sensational accompaniment to your retro office equipment.