康达新材：公司子公司北京力源兴达科技有限公司主营业务为电源变换器模块的研发、设计、生产及销售

Group 1 - The core business of the subsidiary Beijing Liyuan Xinda Technology Co., Ltd. is the research, design, production, and sales of power conversion modules, providing power supply services to customers [1] - The main product is high-frequency switch power conversion modules, which utilize pulse width modulation technology to convert electrical energy from various sources into the required voltage and current for customer devices [1] - The product line primarily targets special equipment, communication devices, instrumentation, testing equipment, industrial equipment, and power communication equipment, with customers mainly in the special equipment industry and the power grid transmission and distribution as well as industrial control sectors [1]