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发明名称
INSERT FOR DRILLING UNIT
摘要
申请公布号
US3603414(A)
申请公布日期
1971.09.07
申请号
USD3603414
申请日期
1970.01.30
申请人
FRANK E. STEBLEY
发明人
FRANK E. STEBLEY
分类号
E21B10/52;E21B10/56;(IPC1-7):E21C13/01;E21C13/06
主分类号
E21B10/52
代理机构
代理人
主权项
地址
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