An improved memorandum device,申请号GB19470002098-传众专利搜索

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发明名称	An improved memorandum device
摘要
申请公布号	GB645830(A)	申请公布日期	1950.11.08
申请号	GB19470002098	申请日期	1947.01.23
申请人	JOHN DUNCAN	发明人
分类号	B42D19/00	主分类号	B42D19/00
代理机构		代理人
主权项
地址

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