Automatic backwater valve,申请号US19280321361-传众专利搜索

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发明名称	Automatic backwater valve
摘要
申请公布号	US1753724(A)	申请公布日期	1930.04.08
申请号	US19280321361	申请日期	1928.11.23
申请人	SHAW WALLACE W	发明人	SHAW WALLACE W.
分类号	E03F5/042	主分类号	E03F5/042
代理机构		代理人
主权项
地址

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