An improved device for maintaining drains clear,申请号GB19330033133-传众专利搜索

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发明名称	An improved device for maintaining drains clear
摘要
申请公布号	GB412489(A)	申请公布日期	1934.06.28
申请号	GB19330033133	申请日期	1933.11.27
申请人	WILLIAM HENRY RICHARDSON	发明人
分类号	E03F9/00	主分类号	E03F9/00
代理机构		代理人
主权项
地址

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