A Mack Model AC truck, 1925.
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Black and white image of a dump truck.

Credit: Courtesy of The Mack Trucks Historical Museum.

Introduced in 1915, Mack Model ACs had a radiator mounted behind the engine, done to minimize accidental damage, which resulted in a distinctive front end design. During World War I, British soldiers were so impressed with the their ruggedness and reliability that they nicknamed the trucks "bull dog Macks."

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