Telephone exchange system,申请号US19300429945-传众专利搜索

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发明名称	Telephone exchange system
摘要
申请公布号	US1812617(A)	申请公布日期	1931.06.30
申请号	US19300429945	申请日期	1930.02.20
申请人	WESTERN ELECTRIC COMPANY, INCORPORATED	发明人	BAKER JOHN H. E.
分类号	H04Q3/00	主分类号	H04Q3/00
代理机构		代理人
主权项
地址

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