Bowling slide rule,申请号US19480048138-传众专利搜索

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发明名称	Bowling slide rule
摘要
申请公布号	US2498421(A)	申请公布日期	1950.02.21
申请号	US19480048138	申请日期	1948.09.07
申请人	MARSHALL HERTIG	发明人	HERTIG MARSHALL
分类号	G06G1/00	主分类号	G06G1/00
代理机构		代理人
主权项
地址

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