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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.
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This section is missing information about elevators use guide rails: oil-lubricated guide shoes, roller guide shoes in high speed elevators or maglev shoes are used to follow the rail, high speed elevator vibration dampers, internal air pressure control and aerodynamic elevator cab and counterweight exterior, kone maxispace counterweightless ...
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The Bailong Elevator, 2009. The Bailong Elevator (Chinese: 百龙电梯; literally Hundred Dragons Elevator) is a glass double-deck elevator built onto the side of a cliff in the Wulingyuan area of Zhangjiajie, China, an area noted for more than 3,000 quartzite sandstone pillars and peaks across most of the site, many over 200 metres (660 ft) in height.
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The first type of crane machine was the shadouf, which had a lever mechanism and was used to lift water for irrigation. [ 3 ] [ 4 ] [ 5 ] It was invented in Mesopotamia (modern Iraq) circa 3000 BC. [ 3 ] [ 4 ] The shadouf subsequently appeared in ancient Egyptian technology circa 2000 BC.
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