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Throughout The Second Half Of The 19th
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Throughout the second half of the 19th century, many technologies converged to advance elevator speed, strength and safety. In the 1860s William Miller developed a steam powered, belt driven model with screw-and-cog gearing.
December 5th, 2011
Viewed 25 Times - Last Visitor from Washington, DC on 04/30/2014 at 12:44 AM
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