If the commodity names are the same, but the codes are different, then there must be differences between the commodities with two different codes. Most of them are reflected in different indicators and parameters, so they are usually distinguished by 5, 6 or 7, 8 subheadings. After the sub-items are distinguished, there may be differences between the supervision certificate and the import tariff rate (there are also different items, but less). For example, 853400 10 and 85340090, the Chinese names of these two projects are (blank) printed circuit boards, but the layers of the two projects are different, one is below 4 layers, and the other is above 4 layers (excluding 4 layers). This example is a bit special, the regulatory documents and tax rates are exactly the same, so this distinction is mainly for the needs of import and export trade statistics. It can be seen that if we make a distinction, it is bound to be inevitable in import and export trade.

1. Trademark is a symbol to distinguish the source of goods or services, and each registered trademark is designated for a certain kind of goods or services. It is precisely for the needs of trademark retrieval, examination and management that some goods with the same attributes are grouped into one category, and all goods and services are divided into 45 categories, forming a trademark classification table-the Classification Table of Goods and Services for Trademark Registration.

2. In the past, the competent trademark authorities of various countries made their own commodity classification tables according to their national conditions and their understanding of commodities, which were used by the competent trademark authorities and trademark registration applicants. The commodity classification table is not static. It will be gradually increased and revised with the richness of commodities and people's understanding of commodities. Since 1923, China has formulated and published five commodity classification tables. By the 1950s, the world economy had developed greatly and international exchanges were more frequent. Some countries believe that the use of their own commodity classification tables can no longer adapt to the international convergence of trademark affairs, which brings trouble to the registration of trademark owners abroad and is not conducive to the development of trademark cause and economy. The trademark authorities in these countries believe that trademark registration needs an internationally unified commodity classification table. In this case, the Nice Agreement came into being.