国机精工：公司超硬材料的业务平台为持股67%的国机金刚石（河南）有限公司

Group 1 - The core viewpoint of the article is that Guojin Precision (国机精工) is actively developing its superhard materials business through its 67% owned subsidiary, Guojin Diamond (河南) Co., Ltd. [1] - Guojin Diamond will focus on key technology research and development in areas such as raw materials, diamond synthesis, structured applications of diamonds, functional applications of diamonds, and related equipment [1]