The High Strength Plastic Navigation Buoy, jointly researched by Shandong Liaocheng Huatian Navigation Buoy Manufacture Co.,Ltd and Shanghai Maritime Administration Ningbo Navigation Buoy Bureau, conqures the difficulties of maintenance free, impact-resistance, environmental protection, long life in the domestic and international navigation buoy field. The navigation buoys have got national patents (Patents No.: zl200720154740.6, zl200820118607.x, zl200810166337.4), fills the domestic and ...