U.S.A.A.F. Tangent Scales For Automatic Bombing Computer, Type HH-1. By Croname Incorporated. Wooden case, approx. 18 x 20 x 7cms containing numerous different metal 'scales' for use with a bomb computer. Includes 2 'holders' for the scales to be used in. Looks unused with some of the scales still being in the original paper sleeves. Light wear to the case, otherwise superb, probably unissued condition. Stock code M15062.