| http://www.w3.org/ns/prov#value | - In one embodiment of the invention, the coupling means is comprised of a flexible, resilient, tubular body portion which is open at each end and which is adapted to be slidably circumposed on a portion of the periphery of a conventional tubular test tube of the type that is closed at one end, the coupling means also including a pair of circumferentially spaced, flexible, resilient and integral fla
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