What are the foreign manufacturers of nitrogen injection equipment, what are the products, the introduction of the product.

I know is the U.S. IGS Group has a wholly owned subsidiary in China, is Simeka Asia Gas Systems Chengdu Co., Ltd. specializing in the production of nitrogen equipment, large and small nitrogen generators for various industries. It is said that the price of their nitrogen generator is higher than that of domestic manufacturers, and the quality is very good. Specifically, you can go to their website to see, Baidu can be searched.