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The first Caterpillar wheel tractor-scraper, called the Caterpillar DW21, was manufactured for heavy construction contractors. It was Caterpillar’s answer to the LeTourneau “Tournapull,” the first-of-its-kind self-propelled scraper made in Peoria, Illinois, by former Caterpillar supplier, Robert LeTourneau. The Caterpillar machine,...