Call metering circuits in telephone systems,申请号US19300462105-传众专利搜索

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发明名称	Call metering circuits in telephone systems
摘要
申请公布号	US1833586(A)	申请公布日期	1931.11.24
申请号	US19300462105	申请日期	1930.06.18
申请人	TELEFONAKTIEBOLAGET L. M. ERICSSON	发明人	NILSSON NILS EMIL
分类号	F16K5/02;H04M15/10	主分类号	F16K5/02
代理机构		代理人
主权项
地址

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