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发明名称
摘要
申请公布号
SU548706(A1)
申请公布日期
1977.02.28
申请号
SU19742049307
申请日期
1974.08.05
申请人
发明人
分类号
E21B43/00;(IPC1-7):E21B43/00
主分类号
E21B43/00
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