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发明名称
摘要
申请公布号
JPS60100491(U)
申请公布日期
1985.07.09
申请号
JP19830192677U
申请日期
1983.12.13
申请人
发明人
分类号
E21C37/06;E21B33/128;(IPC1-7):E21C37/06
主分类号
E21C37/06
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