| http://www.w3.org/ns/prov#value | - In addition, the casing 70 may have a curved outer wall 71 that may extend between the sieve beds 12, which may provide a finished outer surface for the apparatus 10, as best seen in FIGS. 1A and 1B. The casing 70 may be formed from plastic, such as ABS, polycarbonate, and the like, metal, such as aluminum, or composite materials, similar to the other components of the apparatus 10 described herei
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