Rieter's certificate has the following types: Rieter's certificate has only three shapes, three titles, and all three are false. I issued an export-oriented certificate and a Chinese-English certificate. The second is the old light blue, round and square certificate. The third is the new white, right-angled square certificate. Here are three forms of certificates. Li Da is one of only three national intangible cultural inheritors, which can be said to be the Taishan Beidou. But he is very low-key, unwilling to be interviewed by any media, and never let people publicize too much. There are few photos circulating on the internet, and it is difficult to see them in a low-key and introverted way.