| http://www.w3.org/ns/prov#value | - SUMMARY OF THE INVENTION Briefly stated, in accordance with one aspect of the present invention, a rotatable, cylindrical dryer drum is provided which comprises a cylindrical shell and a head at each end of the shell to close the same, the heads including means for rotatably supporting the drum and means for introducing and removing a heat transfer medium to and from portions of the interior of th
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