| http://www.w3.org/ns/prov#value | - The preferred configuration is based upon a fuel cell system, wherein a flowing gaseous fuel, such as hydrogen or carbon monoxide, is directed axially over the outside of the cell, as indicated by the arrow 12, and an oxidant, such as air or O2, indicated by the arrow 14, flows through a feed tube to the end of the cell and then back near the inside wall of the cell.
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