腾达科技：公司主要从事不锈钢紧固件产品的研发、生产与销售

Group 1 - The core viewpoint of the article is that Tengda Technology is actively engaged in the research, production, and sales of stainless steel fasteners, indicating a broad application range for its products [2] Group 2 - The company responded to investor inquiries on its interactive platform, highlighting its main business activities [2]