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The Earthmover Encyclopedia: The Complete Guide to Heavy Equipment of the World. St. Paul, Minnesota, USA: Motorbooks. p. 43. ISBN 978-0-7603-2964-1 In 1981 Komatsu presented the D555A at the Conexpo equipment exhibition in Houston, Texas. "Komatsu America Corp - Equipment - D575A-3SD". komatsuamerica.com. Komatsu America Corp. 2010.
Several types of bulldozer blade can be used on the front of the tractor: Straight ("S-Blade"): A short blade with no lateral curve and no side wings. It can be used for fine grading; Angle: held by a U shape frame that has three holes on each side, to set the blade to 3 positions: right, center, and left.
An IDF Caterpillar D9: a Caterpillar D9R bulldozer with Israeli armour used by the Israel Defense Forces. The armoured bulldozer is a basic tool of combat engineering.These combat engineering vehicles combine the earth moving capabilities of the bulldozer with armour which protects the vehicle and its operator in or near combat.
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Sometimes, a bulldozer is used to push or pull another piece of earth-moving equipment known as a "scraper" to increase productivity. The towed Fresno Scraper , invented in 1883 by James Porteous , was the first design to enable this to be done economically, removing the soil from an area being cut and depositing where needed as fill .
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