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John Spargo Spartacus Educational
Main article primary sources 1 john spargo the bitter cry of children 1905 work in the coal breakers is exceedingly hard and dangerous crouched over the chutes the boys sit hour after hour picking out the pieces of slate and other refuse from the coal as it rushes past to the washers
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Microsizer Air Classifier Progressive Industries Inc
Mills can be complimented with the super high efficient microsizer air classifier and microsizer rmc to increase production and maximize our extensive knowledge of powder processing classifying and size reduction progressive industries inc can help you get the most from your grindingclassifying systems
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Wills Mineral Processing Technology Sciencedirect
In tumbling mills the mill shell is rotated and motion is imparted to the charge via the mill shell the grinding medium may be steel rods balls or rock itself to produce a commercially graded endproduct and clean coal being separated from the heavier shale or highash coal in principle it is the simplest of all gravity processes
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