绿通科技：海明润主营聚晶金刚石复合材料等超硬复合材料的研发、生产和销售

Group 1 - The core business of Haimingrun focuses on the research, production, and sales of polycrystalline diamond composite materials (PDC) and polycrystalline diamond (PCD) [1] - The primary application of these products is in the oil and gas drilling sector, with additional applications in coal mining and mechanical processing [1]