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By 1921, International Harvester supplied motorized trucks at a plant in Springfield, Ohio, which provided a range of transport vehicles primarily known to have pneumatic tires and could travel at high speeds. more, making them cheaper to operate on new routes that were becoming more widely available in the 1920s. These and other transport models distributed by International helped their output increase from just 7,183 trucks in 1920 to more than 39,000 models in 1928 and more than 10,000 the following year.