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发明名称
PACKUNG FUER EINE BOHRLOCHARMATUR
摘要
申请公布号
AT349407(B)
申请公布日期
1979.04.10
申请号
AT19760005653
申请日期
1976.07.30
申请人
W-K-M WELLHEAD SYSTEMS, INC.
发明人
分类号
E21B33/03;E21B33/00;E21B33/04;(IPC1-7):E21B33/02
主分类号
E21B33/03
代理机构
代理人
主权项
地址
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