| http://www.w3.org/ns/prov#value | - A device for mixing a fluid comprising:(a) a conduit having a hollow interior disposed about a central axis;(b) a shaft extending longitudinally through said conduit along said axis; and(c) a plurality of stationary mixing elements extending in series along said axis within said conduit, each of said elements including a hub affixed to said shaft and a plurality of blades affixed to said hub and e
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