The mixing shell only affects the appearance and needs to be selected, and has no effect on the function; the severity is 6. Since the d405 / D406 shell has been produced in batch, a total of 500000 pieces have been produced. 3pcs, 2pcs and 1pc (January 2019) have been found in the mixed material, with an incidence of 6ppm. The logo position is detected by manual visual inspection, and the detection rate is 6. According to the above assessment, the risk level of shell mixing is low.<br>
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