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发明名称
摘要
申请公布号
JPS5273233(U)
申请公布日期
1977.06.01
申请号
JP19750155167U
申请日期
1975.11.17
申请人
发明人
分类号
E21B7/00;A01C5/00;A01C5/04;E02F3/06;(IPC1-7):A01C5/00
主分类号
E21B7/00
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