Improvement in or relating to slide rule,申请号US19500191761-传众专利搜索

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发明名称	Improvement in or relating to slide rule
摘要
申请公布号	US2656978(A)	申请公布日期	1953.10.27
申请号	US19500191761	申请日期	1950.10.24
申请人	THEODORE HAFNER	发明人	NICOLET NICHOLAS E.
分类号	G06G1/04	主分类号	G06G1/04
代理机构		代理人
主权项
地址

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