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发明名称	Sign
摘要
申请公布号	US2288151(A)	申请公布日期	1942.06.30
申请号	US19410397956	申请日期	1941.06.13
申请人	ALEXANDER JOHN W	发明人	ALEXANDER JOHN W.
分类号	G09F7/18	主分类号	G09F7/18
代理机构		代理人
主权项
地址

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