tandem-powered scraper

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Wheel tractor-scraper — In civil engineering, a wheel tractor scraper is a piece of heavy equipment used for earthmoving. The rear part has a vertically moveable hopper (also known as the bowl) with a sharp horizontal front edge. The hopper can be hydraulically lowered… … Wikipedia
Steamroller — A steamroller (or steam roller) is a form of road roller ndash; a type of heavy construction machinery used for levelling surfaces, such as roads or airfields ndash; that is powered by a steam engine. The levelling/flattening action is achieved… … Wikipedia

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