CN205663920U - 一种多级密封面特种球阀 - Google Patents
一种多级密封面特种球阀 Download PDFInfo
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CN111287673A (zh) * | 2020-03-13 | 2020-06-16 | 北京中煤矿山工程有限公司 | 一种带有泥浆防返装置的反井钻机导孔短节 |
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CN111287673A (zh) * | 2020-03-13 | 2020-06-16 | 北京中煤矿山工程有限公司 | 一种带有泥浆防返装置的反井钻机导孔短节 |
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Denomination of utility model: Special ball valve of multistage sealed face Effective date of registration: 20200109 Granted publication date: 20161026 Pledgee: Zigong industrial and Credit Enterprise Investment Co.,Ltd. Pledgor: Sichuan Kaitz Valve MFG. Co.,Ltd. Registration number: Y2020510000004 |
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