Popular gemstone cutting process gem cutting

Abstract In recent years, with the continuous improvement of the gemstone cutting process, new cutting processes have emerged, making the gemstones more colorful. Here are a few of the more popular gemstone cutting processes. (1) Mil.......

What are the criteria for fast shutter doors?


The fast rolling door is a fast door that is commonly used in various public places such as shopping malls, hotels, hotels, etc. It has a good quick opening and fireproof effect. In the initial stage of the fire house, it can effectively block the spread of the flame. L.......