| http://www.w3.org/ns/prov#value | - A tool, such as the end of a flat screwdriver, may be inserted into one of the slots 112C in order to help pry the ring 108C out of the cavity 104C. The rings 108C may be provided in a variety of different colors to help uniquely identify the condition of the tube 16 into which the tube indicator device 18C is inserted.For instance, tube indicator devices 18C may initially be placed into all the t
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