The registration address of the united states of america hydraulic technology company ltd. Is at zhango hook oaks base, hebei province, with the registration authority of the city's market supervision authority and with the legal representation of joon-jin lee, and includes research and development, production and sale of hydraulic tubes, hydraulic instruments, ducts, high-voltage pipes, trans-treading wires, total ducts, rubber products, metal products, hydraulics, metal hoses, plastics, seals** (projects subject to approval by law and approval by the relevant department)