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 7307990000 
未列名钢铁制其他管子附件
Other tube or pipe fittings , of iron or steel, not elsewhere specified or included , other than stainless steel |
7307930000
未列名钢铁制对焊件
Butt welding fittings , of iron or steel, not elsewhere specified or included ,other than stainless steel |
7307920000
未列名钢铁制螺纹肘管、弯管、管套
Threaded elbows, bends and sleeves , of iron or steel, not elsewhere specified or included , other than stainless steel |
7307910000
未列名钢铁制法兰
Flanges of iron or steel, not elsewhere specified or included (other than stainless steel ) |
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