1928 Ford Truck Model AA Dual Duty Special Equipment Sales Brochure. This is a brochure for Dual Duty Company Special Equipment for Ford Trucks. The inside has nice illustrations of trucks with the Dual Duty and states "The Dual Duty Unit for Ford Trucks -- Model AA". The Dual Duty Unit is an additional axle mounted in tandem with the driving axle. There are specifications on the back page along with another nice illustration of a truck with Dual Duty. The edges of the brochure are a little rough.
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