BLACK BOARD ERASER,申请号CAD502809-传众专利搜索

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发明名称	BLACK BOARD ERASER
摘要
申请公布号	CA502809(A)	申请公布日期	1954.05.25
申请号	CAD502809	申请日期
申请人	EARL N. DARLING	发明人	EARL N. DARLING
分类号		主分类号
代理机构		代理人
主权项
地址

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