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经营范围
发明名称
Sealing system
摘要
申请公布号
GB0413042(D0)
申请公布日期
2004.07.14
申请号
GB20040013042
申请日期
2004.06.11
申请人
PETROWELL LTD
发明人
分类号
E21B33/12;E21B33/129
主分类号
E21B33/12
代理机构
代理人
主权项
地址
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