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Huanghua Port DN500 Single Seal Construction
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2009-7 Shougang DN1200 coking coal pipeline operation
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Tianjin DN500 natural gas pipeline operation
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Tianjin DN500 6.4Mpa crude oil double sealing and double blocking operation
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Horizontal drilling operation of Shougang DN1200 coking coal pipeline
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Cangzhou Construction
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Cangzhou De315 PE pipeline double sealing operation
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