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发明名称
Expansible rotary drill bit and method of assembling and disassembling the same
摘要
申请公布号
US2545034(A)
申请公布日期
1951.03.13
申请号
US19470779592
申请日期
1947.10.13
申请人
KAMMERER ARCHER W
发明人
KAMMERER ARCHER W.
分类号
E21B10/34
主分类号
E21B10/34
代理机构
代理人
主权项
地址
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