| http://www.w3.org/ns/prov#value | - The instrument of claim 1, characterized in that the insertion head (1), the hollow shaft (7), the driving mechanism including the actuating wire (91) and the tension wires, connecting elements, shafts, and the annular knife (4) are manufactured of selected hard-anodized aluminum materials, or aluminum-manganese (Al--Mn) alloys.
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