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F. A. Annett, Elevators: Electric and Electrohydraulic Elevators, Escalators, Moving Sidewalks, and Ramps, Third Ed., McGraw-Hill, 1960
FIG. 20-19 AND FIG 20-20
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F. A. Annett, Elevators: Electric and Electrohydraulic Elevators, Escalators, Moving Sidewalks, and Ramps, Third Ed., McGraw-Hill, 1960 FIG. 20-19 AND FIG 20-20
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