| http://www.w3.org/ns/prov#value | - When tension is applied by the anchoring socket 4 to obtain the stretching of the wires 1 a slippage occurs between the head portion 2 and the anchoring body or socket 4, and the softer material of the socket 4 defining the circular gripping edges iS deformed, in such a manner as to form the seating portions or zones 6a (FIG. 6).
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