Electronic commutator for calculators,申请号US19530393840-传众专利搜索

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发明名称	Electronic commutator for calculators
摘要
申请公布号	US2792991(A)	申请公布日期	1957.05.21
申请号	US19530393840	申请日期	1953.11.23
申请人	INTERNATIONAL BUSINESS MACHINES CORPORATION	发明人	CAMBIO EDMOND P. DI
分类号	G06F9/32	主分类号	G06F9/32
代理机构		代理人
主权项
地址

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