国产欧美激情日韩成人三区|成A∨人片在线观看无码|91欧美精品午夜性色福利在线|亚洲一级黄色,男人的天堂久久久,久久综合操,国产超级乱淫视频播放免费

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.