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Tensile testing apparatus for large-diameter bolts, has upper bell-shaped body rotatably arranged on head-plate of lifting device, for placing or removing bolt?keyword=Tensile testing apparatus for large-diameter bolts, has upper bell-shaped body rotatably arranged on head-plate of lifting device, for placing or removing bolt?keyword=Tensile testing apparatus for large-diameter bolts, has upper bell-shaped body rotatably arranged on head-plate of lifting device, for placing or removing bolt?keyword=Tensile testing apparatus for large-diameter bolts, has upper bell-shaped body rotatably arranged on head-plate of lifting device, for placing or removing bolt?keyword=Tensile testing apparatus for large-diameter bolts, has upper bell-shaped body rotatably arranged on head-plate of lifting device, for placing or removing bolt?keyword=Tensile testing apparatus for large-diameter bolts, has upper bell-shaped body rotatably arranged on head-plate of lifting device, for placing or removing bolt?keyword=Tensile testing apparatus for large-diameter bolts, has upper bell-shaped body rotatably arranged on head-plate of lifting device, for placing or removing bolt?keyword=Tensile testing apparatus for large-diameter bolts, has upper bell-shaped body rotatably arranged on head-plate of lifting device, for placing or removing bolt 专利,更快更准确