97超碰人人澡人人,久久久一区二区,亚洲天堂色图片,7777精品伊人久久久大香使用方法,国产午夜一区,日韩av中文字幕一区二区,国产黄色大片儿

Xingtai Steel has 156 patents in force until now
  Updatetime:2020-06-17 Hits:

  As the first batch of national intellectual property advantage enterprises announced by the State Intellectual Property Office, Xingtai Steel has always been promoting technological innovation based on the research concept of “accurate recognition, strict definition, fine analysis and precise improvement”. Now, Xingtal Steel could produce 3347 products which belong to 629 types of steel. Besides, 156 patents in force, including 50 patents for invention are obtained.