A bulldozer is a crawler (caterpillar tracked tractor), equipped with a substantial metal plate (known as a blade), used to push large quantities of soil, sand, rubble, etc, during construction work. The term "bulldozer" is often used to mean any heavy engineering vehicle, but precisely, the term refers only to a tractor (usually tracked) fitted with a dozer blade. That is the meaning used herein. History Bulldozer older version in the museum Sinsheim, Germany]]The first bulldozers were adapted from farm Holt tractors that were used to plough fields. Their versatility in soft ground for logging and road building, lead directly to them becoming the armoured tank in the first war. In 1923, a young farmer named James Cummings and a draftsman named J. Earl McLeod made the first designs for a bulldozer. A replica is on display at the city park in Morrowville, Kansas where the two built the first bulldozer.