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发明名称
Drill guide
摘要
申请公布号
US2236399(A)
申请公布日期
1941.03.25
申请号
US19390290390
申请日期
1939.08.16
申请人
COLD SPRING GRANITE COMPANY
发明人
EICKHOFF JOHN G.
分类号
E21B19/24
主分类号
E21B19/24
代理机构
代理人
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