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发明名称
摘要
申请公布号
FR2281486(B2)
申请公布日期
1982.10.22
申请号
FR19740027542
申请日期
1974.08.08
申请人
TIRASPOLSKY WLADIMIR
发明人
分类号
E21B4/02;F03C2/08;(IPC1-7):E21B3/12;E21B17/04;F03C3/00
主分类号
E21B4/02
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