| http://www.w3.org/ns/prov#value | - The surface grinding is a plane grinding of the flange surface, i.e. so grinds the surface that it lies in a plane perpendicular to the axis of rotation of the wheel hub and with an axial tolerance that is substantially less than 5 ??m, i.e. the maximum axial throw at any point of the surface is less than 5 ??m.
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