| http://www.w3.org/ns/prov#value | - different pitch p.sub.2. For an exemplary 30 mm long anchor, for example, p.sub.1 can be about 2.2 mm and p.sub.2 about 1.8 mm, or the other way around, or other values can be used for these dimensions. The threads 114, 110 of both portions 106, 104
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