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发明名称
DUMMY PLUG PRESSURE RECORDER
摘要
申请公布号
CA2236052(A1)
申请公布日期
1999.10.27
申请号
CA19982236052
申请日期
1998.04.27
申请人
ZILLINGER, FRIEDRICH ERNST;GRANDE, RENE SHOAN
发明人
ZILLINGER, FRIEDRICH ERNST;GRANDE, RENE SHOAN
分类号
E21B43/12;E21B47/01;E21B47/06;(IPC1-7):E21B34/00
主分类号
E21B43/12
代理机构
代理人
主权项
地址
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