Equipment for observing dial tone speed,申请号US19440539019-传众专利搜索

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发明名称	Equipment for observing dial tone speed
摘要
申请公布号	US2405339(A)	申请公布日期	1946.08.06
申请号	US19440539019	申请日期	1944.06.06
申请人	AMERICAN TELEPHONE AND TELEGRAPH COMPANY	发明人	WILLIS MILTON POWELL
分类号	H04M3/36	主分类号	H04M3/36
代理机构		代理人
主权项
地址

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