Throughout the second half of the 19th century, ?
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
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10674842
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Mary Evans / Everett Collection
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Converged Convergence Developed Driven Elevator Elevators Gearing Lifts Mechanics Screw Technologies Throughout
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