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发明名称
摘要
申请公布号
SU560963(A1)
申请公布日期
1977.06.05
申请号
SU19752065113
申请日期
1975.10.04
申请人
发明人
分类号
(IPC1-7):E21B9/16
主分类号
(IPC1-7):E21B9/16
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代理人
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地址
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