Double Elevators' Speed to Hoist "Pay Dirt"

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Title: Double Elevators' Speed to Hoist "Pay Dirt"
Issue Date: 1939-03
Publisher: Ohio State University, College of Engineering
Citation: Ohio State Engineer, vol. 22, no. 4 (March, 1939), 5.
URI: http://hdl.handle.net/1811/35581
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