Sawyer's calculating board,申请号US19530383460-传众专利搜索

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发明名称	Sawyer's calculating board
摘要
申请公布号	US2831512(A)	申请公布日期	1958.04.22
申请号	US19530383460	申请日期	1953.10.01
申请人	GREENEMEYER JOHN R	发明人	GREENEMEYER JOHN R.
分类号	B27B1/00;B27B29/08;G06G1/12	主分类号	B27B1/00
代理机构		代理人
主权项
地址

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