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发明名称
SCHNEIDORGAN UND BOHRMEISSEL
摘要
申请公布号
DE3406441(A1)
申请公布日期
1984.08.23
申请号
DE19843406441
申请日期
1984.02.22
申请人
NL INDUSTRIES,INC.
发明人
WILLIAM SHORT JUN.,LOT
分类号
E21B10/56;E21B10/567;E21B10/573;(IPC1-7):E21B10/52
主分类号
E21B10/56
代理机构
代理人
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