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发明名称
摘要
申请公布号
JPS486844(Y1)
申请公布日期
1973.02.21
申请号
JP19670052297U
申请日期
1967.06.20
申请人
发明人
分类号
E02B7/44;(IPC1-7):E02B7/44
主分类号
E02B7/44
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