... 金属管道接头 Junctions of metal for pipes 金属管道接头 Junctions of metal for pipes 金属管道配件 Pipework of metal ...
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... 金属制管套筒 Pipe muffs of metal 管道用金属接头 Junctions of metal for pipes 金属阀门（非机器部件） Valves of metal, other than parts of machines ...
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