Clock time and call indicating system,申请号US19400313355-传众专利搜索

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发明名称	Clock time and call indicating system
摘要
申请公布号	US2267812(A)	申请公布日期	1941.12.30
申请号	US19400313355	申请日期	1940.01.11
申请人	INTERNATIONAL BUSINESS MACHINES CORPORATION	发明人	BRYCE JAMES W.
分类号	G04G9/00	主分类号	G04G9/00
代理机构		代理人
主权项
地址

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