How about Jiangsu Sanheng Technology Group Co., Ltd.?

Jiangsu Sanheng Technology Group Co., Ltd. Jiangsu Sanheng Technology Group Co., Ltd. is a joint-stock high-tech enterprise with a history of 20 years. China coal mine safety production monitoring system and supporting sensors are professional enterprises. Mainly engaged in the research, development and production of coal mine safety monitoring equipment and a full range of supporting sensors.