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发明名称
摘要
申请公布号
JPS5220780(B1)
申请公布日期
1977.06.06
申请号
JP19700036877
申请日期
1970.05.01
申请人
发明人
分类号
E02B7/42;E02B7/20;(IPC1-7):E02B7/20
主分类号
E02B7/42
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