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发明名称
JORDBORRSKAER
摘要
申请公布号
FI783588(A)
申请公布日期
1979.06.08
申请号
FI19780003588
申请日期
1978.11.23
申请人
DRESSER INDUSTRIES INC
发明人
MITCHELL HOWARD EARL
分类号
E21B10/16;E21B10/52;(IPC1-7):E21B/
主分类号
E21B10/16
代理机构
代理人
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