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发明名称
ENSEMBLE D'ACCOUPLEMENT
摘要
申请公布号
FR2621380(B1)
申请公布日期
1989.12.15
申请号
FR19870013727
申请日期
1987.10.05
申请人
GROMELLE RAYMOND
发明人
分类号
E21B43/013;F16L37/00;(IPC1-7):F16L37/00
主分类号
E21B43/013
代理机构
代理人
主权项
地址
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