Classic Machines ScrapersClassic Machines: Caterpillar’s DW21 scraper revisitedContrafed PUblishingFebruary 27, 2017June 12, 2020 by Contrafed PUblishingFebruary 27, 2017June 12, 2020 Born of necessity, the Caterpillar DW21, the great granddaddy of all Caterpillar 2-axle scrapers, went on to become a very successful scraper for Cat and...