Auxiliary connecting device for automatic telephone switchboards,申请号US19290357392-传众专利搜索

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发明名称	Auxiliary connecting device for automatic telephone switchboards
摘要
申请公布号	US1799916(A)	申请公布日期	1931.04.07
申请号	US19290357392	申请日期	1929.04.23
申请人	MANSFIELD GEORGE D	发明人	MANSFIELD GEORGE D.
分类号	H04M5/02	主分类号	H04M5/02
代理机构		代理人
主权项
地址

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