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发明名称
摘要
申请公布号
JPS5638721(B2)
申请公布日期
1981.09.08
申请号
JP19800119687
申请日期
1980.09.01
申请人
发明人
分类号
E01C3/00;E01C7/00;E01C7/18
主分类号
E01C3/00
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代理人
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