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发明名称
Means for preventing backflow in plumbing systems
摘要
申请公布号
US2310586(A)
申请公布日期
1943.02.09
申请号
US19400331800
申请日期
1940.04.26
申请人
LOHMAN BROS.
发明人
LOHMAN JOHN T.;LOHMAN ROWLAND L.
分类号
E03C1/10
主分类号
E03C1/10
代理机构
代理人
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地址
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