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发明名称
HYDRAULIC ANCHOR DEVICE
摘要
申请公布号
US3599712(A)
申请公布日期
1971.08.17
申请号
USD3599712
申请日期
1969.09.30
申请人
DRESSER INDUSTRIES INC.
发明人
CHARLES W. MAGILL
分类号
E21B23/04;(IPC1-7):E21B23/04
主分类号
E21B23/04
代理机构
代理人
主权项
地址
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