| http://www.w3.org/ns/prov#value | - possible by a variety of means, including the mechanism illustrated in FIGS. 11A and 11B. This shows that an adjustment mechanism 12 is provided near opposite ends of guide bar 10 so as to allow for air flow control similar in nature to that shown in FIGS. 5A and 5B by movement of end portions of guide number 1 in an upper or lower position.
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