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The dump truck is thought to have been first conceived in the farms of late 19th century Western Europe. As early as 1905, the first motorized dumping vehicles were developed. The first motorized dump trucks in the United States were developed by small equipment companies such as Galion Buggy Co. and Lauth-Juergens among many others around 1910. Such companies flourished during World War I due to massive wartime demand. Companies like Galion Buggy Co. continued to grow after the war by manufacturing a number of express bodies and some smaller dump bodies that could be easily installed on either stock or converted (heavy-duty suspension & drivetrain) Model T chassis prior to 1920. Galion and Wood Mfg., Co. built all of the dump bodies offered by Ford on their heavy-duty AA and BB chassis during the 1930s. Galion (now Galion Godwin Truck Body Co.) is the oldest known truck body manufacturer still in operation today. The first known Canadian dump truck was developed in Saint John, New Brunswick when Robert T. Mawhinney attached a dump box to a flat bed truck in 1920. The lifting device was a winch attached to a cable that fed over sheave (pulley) mounted on a mast behind the cab. The cable was connected to the lower front end of the wooden dump box which was attached by a pivot at the back of the truck frame. The operator turned a crank to raise and lower the box. The first dump bed apparatus on a wheeled vehicle patented in Canada Source: Wikipedia.org