Jining Donghong Machinery Co., Ltd supply Mast A type JJ17401, JJ22542,JJ31545, Mast K type JJ17041,JJ22543,JJ31545,JJ45045,JJ67548, Derrick HJJ11322,HJJ11231,HJJ13531,HJJ15833,HJJ18043,HJJ22545,HJJ31547,Offshore Derrick HJJ9029,HJJ11329,HJJ13533,HJJ16031,HJJ18033,HJJ22533,HJJ31545,HJJ31547,HJJ45045
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