Movable magnetic marker,申请号US19300494860-传众专利搜索

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发明名称	Movable magnetic marker
摘要
申请公布号	US1879002(A)	申请公布日期	1932.09.27
申请号	US19300494860	申请日期	1930.11.11
申请人	ALLES CLIFTON C	发明人	ALLES CLIFTON C.
分类号	G09B15/02	主分类号	G09B15/02
代理机构		代理人
主权项
地址

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