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一种套管段铣工具专利证书
26
2021
/
05
一种新型打捞矛专利证书
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一种用于石油天然气的高耐磨鞋专利证书
一种油田钻井用下套管装置专利证书
一种整体阀芯式考克阀专利证书
一种钻铣式打捞公锥专利证书