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发明名称
Rotary drill apparatus
摘要
申请公布号
US2984310(A)
申请公布日期
1961.05.16
申请号
US19570655620
申请日期
1957.04.29
申请人
MEIER CHARLES A
发明人
MEIER CHARLES A.
分类号
E21B4/04;E21B23/00
主分类号
E21B4/04
代理机构
代理人
主权项
地址
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