Ship repair, General items: Sales of hydraulic power machinery and components; Pump and vacuum equipment sales; Ship towing service; Sales of liquid airtight components and systems; Gear and gear reduction, transmission sales; Sales of bearings, gears and transmission components; Servo control mechanism sales; Sales of machine tool functional parts and accessories; Machinery and equipment sales; High speed precision heavy duty bearing sales; Bearing sales; Mining machinery sales; Sales of railway transport infrastructure; Sales of special equipment for environmental protection; Sales of special instruments for environmental monitoring; Agricultural machinery sales; Installation and maintenance of specialized machinery for agriculture, forestry, animal husbandry and secondary fishery; General mechanical equipment installation services; Domestic shipping agency; Domestic freight forwarder; Port cargo handling activities; Technical service, technology development, technology consultation, technology exchange, technology transfer, technology dissemination