我把护士日出了白浆-大地资源中文第二页在线观看完整版-少妇高潮流白浆在线观看-国产精品久久久久久精品电影

■ Before 1985 

State-owned enterprise, mainly engaged in the extraction of magnesite.

■ 1985 Oct.  –1990 May 

Began the business of calcining and processing of magnesite.

■ 1990  Jun. 

Change of legal form to private enterprise.

■ 1999  Jun. 

Change of legal form to private joint-stock enterprise. Started the production and sales of magnesium chemical products.

■ 2000  Jun. - 2005 

Change of legal form to joint-stock group, and quickening the development of operation in magnesium chemical industry.

■ 2009  

Drafting China National Standard of Magnesium Sulfate for agriculture.
May.  Holding the First International Magnesium Fertilizer Seminar.
Dec.  Foundation of Magnesium Chemical Industry Institute.

■ 2010   Apr. 

Attained the national patent for production technology.

■ 2012  Jul.   

The construction of Yingkou Magnesite Technology Holdings Co., Ltd – the subsidiary factory of Yingkou Magnesite Chemical Ind Group Co., Ltd  - further expanded the investment in magnesium chemical industry.

■ 2013 Mar. 

Attained the national patent for production technology.

■ 2014  Oct. 

“Magnesium Sulphate for Agriculture” was listed as the industrialization demonstration project by China's Ministry of Science & Technology.

■ 2015   Jun.

Obtained a new type of proprietary technology.