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发明名称
摘要
申请公布号
JPS5420773(B2)
申请公布日期
1979.07.25
申请号
JP19740065462
申请日期
1974.06.07
申请人
发明人
分类号
E21D9/06;F16L1/00
主分类号
E21D9/06
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