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发明名称
SEALED DRILL-STRING JOINT
摘要
申请公布号
CA812638(A)
申请公布日期
1969.05.13
申请号
CAD812638
申请日期
申请人
CENTRAL MINE EQUIPMENT COMPANY
发明人
CHARLES L. RASSIEUR
分类号
主分类号
代理机构
代理人
主权项
地址
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