The authoritative quality assurance company of Ship-to-Shore Crane, Marine engineering machinery (Functional Vessel, Tug Boat, Ferry, Pilot Boat, Structure Components) etc.

Defender Firm international Ltd.(DEF) is a container crane technical support, technical consulting and quality control as the main business. It has a registered office in Nantong, China to handle quality assurance on port machinery and marine engineering machinery manufacturing works carried out in factories in China. We have clients from Asia, Africa, Middle East, Europe, both American continents and China.