IMMEDIATE RINGING IN A STEP-BY-STEP TELEPHONE SYSTEM,申请号USD3551604-传众专利搜索

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发明名称	IMMEDIATE RINGING IN A STEP-BY-STEP TELEPHONE SYSTEM
摘要
申请公布号	US3551604(A)	申请公布日期	1970.12.29
申请号	USD3551604	申请日期	1969.02.26
申请人	BELL TELEPHONE LAB. INC.	发明人	AMOS E. JOEL JR.
分类号	H04Q3/00;(IPC1-7):H04M3/04	主分类号	H04Q3/00
代理机构		代理人
主权项
地址

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