Improvements in or relating to date indicators,申请号GB19350003833-传众专利搜索

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发明名称	Improvements in or relating to date indicators
摘要
申请公布号	GB451506(A)	申请公布日期	1936.08.06
申请号	GB19350003833	申请日期	1935.02.06
申请人	ARTHUR PREEN;GEOFFREY PREEN	发明人
分类号	G04B19/243	主分类号	G04B19/243
代理机构		代理人
主权项
地址

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