| http://www.w3.org/ns/prov#value | - r at a predetermined position during a kneading operation, wherein an outer surface of said plug has a groove formed therein, said device including an O-ring of an elastomeric material located within said groove thereby to form a seal between said outer surface of said plug and an interior of said hollow cylindrical body portion; introducing calcium phosphate-based cement and a kneading liquid int
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