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发明名称
Pressure core drilling apparatus
摘要
申请公布号
US2381845(A)
申请公布日期
1945.08.07
申请号
US19420442399
申请日期
1942.05.11
申请人
REED ROLLER BIT COMPANY
发明人
STOKES JOHN C.
分类号
E21B25/08
主分类号
E21B25/08
代理机构
代理人
主权项
地址
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