Telephone metering system,申请号US19290369028-传众专利搜索

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发明名称	Telephone metering system
摘要
申请公布号	US1778319(A)	申请公布日期	1930.10.14
申请号	US19290369028	申请日期	1929.06.07
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	HAGUE ALFRED 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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