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发明名称
摘要
申请公布号
JPS639668(Y2)
申请公布日期
1988.03.22
申请号
JP19820162337U
申请日期
1982.10.28
申请人
发明人
分类号
E21B10/00;B28D1/14;E21B10/32;(IPC1-7):E21B10/32
主分类号
E21B10/00
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代理人
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