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Throughout The Second Half Of The 19th
Photograph - Photograph
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 35 Times - Last Visitor from Denver, CO on 12/16/2014 at 7:00 PM
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