| http://www.w3.org/ns/prov#value | - Second, the tools themselves are a variable, in terms of the condition of the mounting surfaces and tube grooves.The third variable is the setup of the tools relative to each other and the forces the machine creates during clamping and bending.The tube material variable is both dimensional and metallurgical???the mechanical properties of the tube metal such as hardness and strength.The last variab
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