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Immerged Double Spiral Type For Graphite Mine Safeway System

Immerged double spiral type for scheelite high popularity.Us2047202a classifier google patentsow assuming that we have a spiral in the classifier, not necessarily of the squeeze spiral type as is the helical trough 56, but an ordinary spiral, in order to remove the oversize or sands as they settle on the bottom of the classifier, another.

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