Telephone switchboard system,申请号US19450627082-传众专利搜索

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发明名称	Telephone switchboard system
摘要
申请公布号	US2468749(A)	申请公布日期	1949.05.03
申请号	US19450627082	申请日期	1945.11.06
申请人	GROH BERNARD C	发明人	GROH BERNARD C.
分类号	H04M5/10	主分类号	H04M5/10
代理机构		代理人
主权项
地址

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