Special trunk circuits for transmitting tones to calling subscribers,申请号US19480057382-传众专利搜索

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发明名称	Special trunk circuits for transmitting tones to calling subscribers
摘要
申请公布号	US2591580(A)	申请公布日期	1952.04.01
申请号	US19480057382	申请日期	1948.10.29
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	MICHAL JOSEPH
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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