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发明名称
VERFAHREN ZUR UNTERSUCHUNG DES WIDERSTANDES UND DES DREHMOMENTVERLUSTES BEIM BOHREN.
摘要
申请公布号
DE3764599(D1)
申请公布日期
1990.10.04
申请号
DE19873764599
申请日期
1987.10.01
申请人
ANADRILL INTERNATIONAL S.A., PANAMA, PA
发明人
SHEPPARD, MICHAEL C., SHUDY CAMPS CAMBRIDGE, GB;WICK, CHRISTIAN, N-5061 KOKSTAD BERGEN, NO
分类号
E21B44/00;(IPC1-7):E21B44/00
主分类号
E21B44/00
代理机构
代理人
主权项
地址
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