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Construction of gypsum mining equipment

In apparatus for washing bulk material and having a rotary drum within which the material is commingled with water, means for feeding the material into one end of the drum comprising a rotatably mounted feed ring having inwardly extending flanges, an inner delivery ring mounted to rotate co-axially with the feed ring and hav ing ports therein,construction of quarry site ducts extending radially between the ports and the feed ring for carrying the bulk material from the feed ring to the delivery ring, a conical member so mounted centrally within the delivery ring as to guide bulk material emanating from the ports into the drum, and partitions extending radially between the conical member and the delivery r

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