Telephone exchange system,申请号US19310560543-传众专利搜索

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发明名称	Telephone exchange system
摘要
申请公布号	US1863330(A)	申请公布日期	1932.06.14
申请号	US19310560543	申请日期	1931.09.01
申请人	WESTERN ELECTRIC COMPANY, INCORPORATED	发明人	VRIENDT CHARLES DE
分类号	H04Q3/42	主分类号	H04Q3/42
代理机构		代理人
主权项
地址

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