| http://www.w3.org/ns/prov#value | - ent receptacle in the stack, each lid further including an annular sealing ring extending perimetrally about the central portion thereof, the sealing ring including adjacent walls extending generally coaxially with the side wall of the receptacle and joined at their upper ends to define between their facing surfaces and below their upper end an inverted, generally U-shaped groove for sealingly rec
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