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发明名称
摘要
申请公布号
JPS5214012(B2)
申请公布日期
1977.04.19
申请号
JP19730064364
申请日期
1973.06.09
申请人
发明人
分类号
E02B17/00;E02D29/07;E04H1/00;E04H3/10
主分类号
E02B17/00
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