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发明名称
Drilling tool
摘要
申请公布号
US2215948(A)
申请公布日期
1940.09.24
申请号
US19390252364
申请日期
1939.01.23
申请人
INGERSOLL-RAND COMPANY
发明人
WILLIAMS PETER A.
分类号
E21B10/58
主分类号
E21B10/58
代理机构
代理人
主权项
地址
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