Original issue, US Army Technical Manual, 26 pages, size is 8 1/4" x 10 3/4", stapled, three hole punched, dated 19 Februry 1974. This is not a commercial copy or print but an original issue government print issued in 1974. This publication is titled - TM 5-6350-263-13, Operator, Unit and Depot Maintenance for Detector, Alarm, Anti-Intrusion: Restricted Area: AAU, DT-383/GSQ and Battery Power Supply, PP-6570/GSQ-154(V). Publication is designed to provide information and instructions for maintenance requirements and procedures at all levels of maintenance for the detector. Very well illustrated using photographs.