What are the domestic UAV 550 engine manufacturers?

Td550 UAV of Xiamen Limbach Aeroengine Co., Ltd. is a plateau unmanned helicopter launched by United Aircraft Corporation for high altitude, cold and other plateau environments and related scenes. By July 19, 2023, its engine manufacturer is only Xiamen Limbach Aeroengine Co., Ltd., and a two-stroke engine production line will be established in Xiamen to meet the needs of UAV engines and general aero engines. TD550 is a coaxial twin-rotor UAV newly developed by AVIC.