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发明名称
Vacuum breaking device in water systems
摘要
申请公布号
US2217132(A)
申请公布日期
1940.10.08
申请号
US19390283759
申请日期
1939.07.07
申请人
O'BRIEN JOHN R
发明人
O'BRIEN JOHN R.
分类号
E03C1/10
主分类号
E03C1/10
代理机构
代理人
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