line of hitch of parallelism 平行性的线
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General side box for parts parallelism, perpendicularity and testing and marking, universal side boxes designated for inspection or precision of the workpiece at any Angle line.
一般方箱用于零部件平行度、垂直度和检验和划线，万能方箱用于检验或划精密工件的任意角度线。
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