大连电瓷：公司主业为输电线路用瓷、复合绝缘子等的研发、生产及销售

Core Viewpoint - Dalian Electric Porcelain focuses on the research, production, and sales of porcelain and composite insulators for power transmission lines and power stations, primarily serving domestic and international power grid companies and their subsidiaries [2]. Company Overview - The company's main products include porcelain and composite insulators for power transmission lines, porcelain and composite insulators for power stations, and electric porcelain fittings [2]. - The primary customers are domestic and international power grid companies and their subordinate units, with some products also supplied to main engine manufacturers or engineering general contractors [2].