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A bullDOZER or DOZER (also called a crawler) is a large, motorized machine that travels on continuous tracks or large tires and is equipped with a metal blade to the front for pushing material: soil, sand, snow, rubble, or rock during construction or conversion work. When needed, a hook-like device (termed a ripper) can be mounted on the rear to loosen dense materials.BullDOZERs can be found on a wide range of sites, mines and quarries, military bases, heavy industry factories, engineering projects, and farms.The word "bullDOZER" refers only to a tractor fitted with a DOZER blade. The word is sometimes used inaccurately for other earth moving equipment such as front-end loaders.