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我局邮政营业使用的出售机为JS4A1型,当出售小于规定尺寸的邮票时,易出双张故障。对于这种故障,需要从电路和机械两个方
Our bureau postal business uses the vending machine JS4A1 type, when the sale is smaller than the stipulated size the stamp, is apt to appear the double sheet breakdown. For this failure, the need for both circuit and machinery