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我厂生产的交换机和电话机产品中变压器的侧板零件大体分两种类型(见图A),其材料都是酚醛层压纸板,采用冲压工艺沁制而
I produced the switchboard and telephone products in the transformer side panel components generally divided into two types (see Figure A), the material is phenolic laminated cardboard, using stamping process Qin and