The Caterpillar D7 is a large track-type tractor designed and manufactured by Caterpillar Inc. Though it comes in many configurations it is most commonly sold as a bulldozer equipped with a detachable large blade and a rear ripper attachment in recent years. Early versions had Bulldozer gear by 3rd party manufacturers like LeTourneau added that used cable control units before hydraulics became more common after WWII. A lot of tractors were sold for pulling Scrapper boxes and trailed implements. The UK received some of the early models under lend lease during WWII. After the war they were sold off and contractors and farmers bought them. A few examples have started to be saved and are appearing in plant collections and at shows.
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