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叙述了地坑拼箱造型生产大型异形铸件“司南仪”的经验。拼箱造型由三节高度不同的砂箱首尾相拼而成
Describes the experience of the production of “Si Nan Yi”, a large-scale special-shaped castings, for the construction of pit crampons. Pinxiang shape from three different levels of sand box end to end spell