| http://www.w3.org/ns/prov#value | - inner concave surface for engaging the roundedresilient body, wherein lubricant is provided between the nucleus body and the concaval-convex elements.19. .[.A vertebral.]. .Iadd.An intervertebral .Iaddend.endoprosthesis comprising an integral disc unit, said unit including a pair of confronting L-shaped supports having concaval-convex shapes in given legs, a resilient body interposedbetween the su
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