Pattern Punch: for punching holes in order to hang patterns on a hook.
样板钻孔机：为了把样板挂在钩子上，用它在样板上打洞。
Special pattern was used to weld core iron to guarantee position accuracy of cast holes;
采用专用胎具焊接芯骨以保证铸孔的位置精度；
Special pattern was used to weld core iron to guarantee position accuracy of cast holes;
采用专用胎具焊接芯骨以保证铸孔的位置精度；
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