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A round manhole cover of a given diameter has a smaller surface area than a square cover of the same width, thus less material is needed to cast the manhole cover, meaning lower cost. The bearing surfaces of manhole frames and covers are machined to assure flatness and prevent them from becoming dislodged by traffic.
A drain cover is a cover with holes (e.g. a manhole) or a grating used to cover a drain, to prevent unwanted entry of foreign objects, or injury to people or animals. It allows drainage of liquids but prevents entry from large solid objects, and thus acts as a coarse filter. A sink drain cover is a drain cover used to cover the sink drain.
Some roller coasters use drive tires instead of a chain on lift hills. Notable examples include many junior coasters made by Vekoma and Zierer, The Olympia Looping traveling roller coaster, and Mindbender at Galaxyland. Drive tires are also used to power other types of amusement rides, such as ferris wheels, Pirate Ships, and other spinning rides.
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Now with a company to manufacture the track, B&M built its first roller coaster, a stand-up roller coaster, Iron Wolf, which opened in 1990 at Six Flags Great America. [ 8 ] [ 9 ] Two years later, Bolliger & Mabillard built another project for Six Flags Great America, Batman: The Ride , the world's first inverted roller coaster , which brought ...
The pit is usually a large opening ranging from 4–6 feet (1.2–1.8 m) wide, 20–40 feet (6.1–12.2 m) long and 6–10 feet (1.8–3.0 m) deep. Some orchestra pits have lifts or elevators that can raise the floor of the pit up to the same height as the stage. This allows for easier movement of instruments among other things.
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Employing a solid cover or grating that is flush with the surrounding surface, this drain is commonly made of concrete in-situ and with the option of using polymer- or metal-based liners or a channel former to aid in channel crafting and slope formation. The drain is characterized by its long length and narrow width, the cross-section of the ...
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