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发明名称
ROERTANG.
摘要
申请公布号
NO141906(B)
申请公布日期
1980.02.18
申请号
NO19740004434
申请日期
1974.12.09
申请人
WEATHERFORD OIL TOOL GMBH,
发明人
DREYFUSS, WILFRIED,;OBERDOERFER, HARTMUT,
分类号
E21B19/16;(IPC1-7):E21B19/16
主分类号
E21B19/16
代理机构
代理人
主权项
地址
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