| http://www.w3.org/ns/prov#value | - the tube shown in FIGS. 8 and 9; FIG. 12 is a view similar to FIGS. 9 and 10 showing another modification of the invention; FIG. 13 is a view similar to FIGS. 9 and 10 illustrating still another modification of the invention; FIG. 14 is an enlarged fragmentary view of one portion of FIG. 13; FIGS. 15 and 16 are views similar to FIGS. 12 and 13 showing modifications thereof; FIG. 17 is an enlarged
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