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发明名称
Drill head retract mechanism
摘要
申请公布号
US3401756(A)
申请公布日期
1968.09.17
申请号
US19660604059
申请日期
1966.12.22
申请人
ODGERS DRILLING INC.
发明人
SVENDSEN WALTER W.
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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