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发明名称
Drilling tool
摘要
申请公布号
US2360088(A)
申请公布日期
1944.10.10
申请号
US19420466626
申请日期
1942.11.23
申请人
WALKER CLINTON L
发明人
WALKER CLINTON L.
分类号
E21B10/66
主分类号
E21B10/66
代理机构
代理人
主权项
地址
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