| http://www.w3.org/ns/prov#value | - Because half of the tube assembly of first and second hemicylindrical tubes 421 and 423 is supported by the frame 631, the second hemicylindrical tube 423 is left to move only slightly and assuming that FIG. 45 is an upper view and that the pivoting of the second hemicylindrical tube 423 is accomplished at a lower level, especially at the level of lower pivot axis 437, the frame 631 is left to con
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