| http://www.w3.org/ns/prov#value | - However, the phrase "substantially free is used herein as a recognition that when the clutch surfaces 12 and 14 initially begin to rotate relative to each other, there may be a slight, almost negligible distal movement of the obturator 30 relative to the cannula 20 which would depend on a number of factors including the spring constant of the spring 50 and the types of surfaces used for the frict
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