Ventilated conduit riser cap,申请号US19570657260-传众专利搜索

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发明名称	Ventilated conduit riser cap
摘要
申请公布号	US2938941(A)	申请公布日期	1960.05.31
申请号	US19570657260	申请日期	1957.05.06
申请人	ROBERTS JR EARL W	发明人	JR. EARL W. ROBERTS,
分类号	H02G9/06	主分类号	H02G9/06
代理机构		代理人
主权项
地址

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