| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF DRAWINGS [0015]FIG. 1 of the accompanying drawings is a schematic section through a first tube apparatus of the present invention, the section being taken in a plant perpendicular to the axis of the tube apparatus; [0016]FIG. 2 is a schematic section, similar to that of FIG. 1, through a second tube apparatus of the present invention; [0017]FIG. 3 is a schematic vertical secti
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