| http://www.w3.org/ns/prov#value | - or receiving the removed sludge, and a mechanism for rotating said shaft and said vanes, said mechanism including guide means for rotating said vanes on said axles and in a sense bunching said vanes ahead of said second position and spreading them apart at said second position in the vicinity of the drain, thereby facilitating the removal of said sludge from said vanes by said sludge-removal means
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