| http://www.w3.org/ns/prov#value | - However, on the other hand, in a case where the leg portions 5, 5 are inclined in different directions from each other in accordance with the lead angle of the screw shaft, the joining surfaces 6, 6 of the respective divided parts 4 a, 4 a are not positioned in the same one plane and provide such a shape as like as twisted.
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