It refers to the PCB board in the production process there is A molding method called punching, punching the mold used, the mold is divided into A,B punching die A,B,C punching die...
It refers to the PCB board in the production process there is A molding method called punching, punching the mold used, the mold is divided into A,B punching die A,B,C punching die can refer to thank you