| http://www.w3.org/ns/prov#value | - If the material is a metal it would need a Rockwell hardness in the range of 20-110C. If the material is plastic it would have a Rockwell hardness in the range 80-130A.As the billet of material is extruded, it has a top surface having a predetermined convex cross-sectional initially as extruded curvature and a bottom surface having a predetermined concave cross-sectional initially as extruded curv
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