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发明名称
摘要
申请公布号
DE3500492(C2)
申请公布日期
1987.01.02
申请号
DE19853500492
申请日期
1985.01.09
申请人
WEATHERFORD OIL TOOL GMBH, 3012 LANGENHAGEN, DE
发明人
SCHULZE-BECKINGHAUSEN, JOERG E., 3008 GARBSEN, DE
分类号
E21B19/16;(IPC1-7):E21B19/16
主分类号
E21B19/16
代理机构
代理人
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