Improvements relating to interchangeable price signs or the like,申请号GB19490018807-传众专利搜索

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发明名称	Improvements relating to interchangeable price signs or the like
摘要
申请公布号	GB674241(A)	申请公布日期	1952.06.18
申请号	GB19490018807	申请日期	1949.07.18
申请人	JOHN COLIN CAMPBELL	发明人
分类号	G09F3/20	主分类号	G09F3/20
代理机构		代理人
主权项
地址

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