| http://www.w3.org/ns/prov#value | - Alternative ball constructions based on ceramics, particularly zirconia and alumina, have also been investigated because of the extremely high hardness values associated with these materials as disclosed in U.S. Pat. No. 5,180,394 to Davidson; U.S. Pat. No. 3,871,031 to Boutin; and Cooper et al., Ceramic Bearing Surfaces In Total Artificial Joints: Resistance to Third Body Wear Damage From Bone Ce
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