| http://www.w3.org/ns/prov#value | - The embodiment shown in FIG. 3 is the same as that shown in FIG. 2 except for the shapes of the bottom surface 17 of the impeller 1 and the bottom plate 24 of the casing 2 and except that the auxiliary vanes 18 and the water purging through holes 241 are provided.
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