The Martin Power Operated Gun Turret - Upper Original Type, Maintenance and Servicing. Part 2-C - Trouble Shooting. Approximately 13.5 x 9.5cm, 83p. A restricted manual reproduced by Dept. L.F in October 1943. Actually produced from an official war department film strip prepared by the 3rd Training Film Preparation Unit with the cooperation of the Power Turret Division of the Armament Department, Lowry Field. Illustrated manual for the maintenance of the gun turret used in the B-24 bomber. Very good used condition. Stock code P20104.