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发明名称
摘要
申请公布号
GB1257471(A)
申请公布日期
1971.12.22
申请号
GBD1257471
申请日期
1968.09.20
申请人
发明人
分类号
F15B13/04;F16K27/04
主分类号
F15B13/04
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