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发明名称
Backflow preventer
摘要
申请公布号
US2503424(A)
申请公布日期
1950.04.11
申请号
US19450572792
申请日期
1945.01.15
申请人
SNYDER LEONARD L
发明人
SNYDER LEONARD L.
分类号
E03C1/10;F16K15/06
主分类号
E03C1/10
代理机构
代理人
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地址
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