Telephone system with cyclic route busy test,申请号US19490069720-传众专利搜索

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发明名称	Telephone system with cyclic route busy test
摘要
申请公布号	US2621255(A)	申请公布日期	1952.12.09
申请号	US19490069720	申请日期	1949.01.07
申请人	MERCER RICHARD	发明人	MERCER RICHARD
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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