2. Look at the top four first, such as the beginning of 4 100, which represents Henan. The following summarizes the administrative division codes of each province.
3. The fifth and sixth places are 16, representing printing in 20 16.
4. The seventh digit 3 represents the batch, that is, the third batch printed.
5. The eighth digit 1 indicates that this invoice is in Chinese, and the others are 2, 3 and 4, representing Chinese-English, Tibetan-Chinese and Uygur-Chinese respectively.
6. The ninth digit of 6 indicates that this invoice is 6 copies, that is, this invoice is always divided into 6 copies.
7. The tenth digit of 0 indicates that this invoice is a computer invoice.