| http://www.w3.org/ns/prov#value | - FIG. 19 shows a top view of an alternative embodiment similar to those shown in FIGS. 17 and 18, except with a tensioning device added to provide for varying the amount of tension by which a flexible membrane envelope may be held and suspended across a supporting structure such as a containment vessel or tank, such that variation of such tensioning may be achieved at any time during filtration, an
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