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发明名称
摘要
申请公布号
JPS492358(A)
申请公布日期
1974.01.10
申请号
JP19720041611
申请日期
1972.04.24
申请人
发明人
分类号
F16L41/06;E03B7/04
主分类号
F16L41/06
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