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发明名称
摘要
申请公布号
DD95157(A1)
申请公布日期
1973.01.12
申请号
DD19720161921
申请日期
1972.03.30
申请人
发明人
分类号
F16J15/32;(IPC1-7):F16J15/34
主分类号
F16J15/32
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