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Scientific American, Vol. 69, No. 18 (1893) (1893)
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alances load, and works to its fullest efficiency only when every load it. signal, at which the doors at the top and bottom are closed. There are conditions, however, to which steam and hydrau- The electric motor which operates each machine is of 15 horse lic elevators are especially suited, and… … LIBERAL ARTS BUILDING, © 1893 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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