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U.S.A.A.F. B-17 Load Adjuster

By Cox & Stevens Aircraft Corp. Load adjuster for the B-17E & B-17F \'Flying Fortress\' bombers. Looks similar to a conventional slide rule but was used to ensure the correct weight distribution throughout the airframe depending on the amount of fuel, bombload etc. A bit grubby and with minor loss of the white plastic \'coating\' in places (see photos). Also lacks the sliding \'cursor\'. Complete with fully marked leather case. Stock code M16772.