| http://www.w3.org/ns/prov#value | - , including no grooves (or more than the three grooves 36, 38, 40, depicted in FIGS. 3, 3A, and 4), if so desired, and that regardless of the number of grooves present, the tube indicator device 18A may have any number of O-rings 20, 22, 24 inserted in the O-ring-receiving grooves 36, 38, 40 respectively, including having no O-rings, as depicted in the tube indicator device 18 of FIG. 3.All the O-
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