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发明名称
AVVIKSBOREVERKTOEY.
摘要
申请公布号
NO905190(D0)
申请公布日期
1990.11.29
申请号
NO19900005190
申请日期
1990.11.29
申请人
BAKER HUGHES INCORPORATED
发明人
JUERGENS, RAINER;ROEPER, RUDOLF;KREHL, DIETMAR;FELD, DAGOBERT;OPPELT, JOACHIM
分类号
E21B4/16;E21B7/06;E21B7/08;(IPC1-7):E21B/
主分类号
E21B4/16
代理机构
代理人
主权项
地址
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