Lingqiao (hereinafter referred to as "Lingqiao Environmental Protection") can trace its origins back to the Shanghai Lingqiao Environmental Protection Equipment Factory established in 1983, which was transformed into a limited company in 2004. It is a high-tech enterprise that integrates the research, development, production, and sales of high-performance polytetrafluoroethylene microporous membranes for purifying PM2.5, as well as coated filter bags and cartridges. The company has been continuously awarded the "Shanghai High-tech Enterprise" certification for 20 years. Located adjacent to the China (Shanghai) Pilot Free Trade Zone, the company boasts two production bases, one situated in Gaoqiao Town, Pudong New Area, Shanghai (covering approximately 50 acres) and the other in Haimen Port New Area, Nantong City, Jiangsu Province (covering approximately 100 acres). The company holds the registered trademark "LH Linghuan," which has been recognized as a "Shanghai Famous Trademark.".

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