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发明名称
Drilling control
摘要
申请公布号
US2136356(A)
申请公布日期
1938.11.08
申请号
US19350056994
申请日期
1935.12.31
申请人
HILD FREDERIC W
发明人
HILD FREDERIC W.
分类号
E21B19/08
主分类号
E21B19/08
代理机构
代理人
主权项
地址
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