| http://www.w3.org/ns/prov#value | - As can best be seen in FIGS. 2 and 3, each of the passageways 3 and 4 are connected along their lengths in fluid transfer relation to one or more fluid inlets 7 which are constructed and arranged to direct treating fluid, and preferably gaseous fluids, such as air, oxygen, nitrogen and the like, circumferentially around the passageways 3 and 4 in countercurrent directions.
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