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Leopold Nicholas Plein

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Conveying machineryMechanization trends in metal and nonmetal mining as indicated by sales of underground loading equipmentLeopold Nicholas Plein

Mechanization trends in metal and nonmetal mining as indicated by sales of underground loading equipment

Leopold Nicholas Plein · Works Progress Administration, National Research Project and Dept. of the Interior, Bureau of Mines

19 sayfa · 1937

Mining machinery / Hoisting machinery / Mineral industries / Conveying machinery