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发明名称
摘要
申请公布号
DD127123(A1)
申请公布日期
1977.09.07
申请号
DD19760194313
申请日期
1976.08.13
申请人
发明人
分类号
E21B49/00;(IPC1-7):E21B49/00
主分类号
E21B49/00
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代理人
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地址
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