CALL-WAITING ARRANGEMENT FOR STEP BY STEP TELEPHONE SYSTEMS,申请号CA19740217095-传众专利搜索

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发明名称	CALL-WAITING ARRANGEMENT FOR STEP BY STEP TELEPHONE SYSTEMS
摘要
申请公布号	CA1022657(A)	申请公布日期	1977.12.13
申请号	CA19740217095	申请日期	1974.12.30
申请人	COLPOYS, JOHN R.	发明人	COLPOYS, JOHN R.
分类号		主分类号
代理机构		代理人
主权项
地址

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