Circuit for marking a line as busy,申请号US19470767529-传众专利搜索

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发明名称	Circuit for marking a line as busy
摘要
申请公布号	US2574224(A)	申请公布日期	1951.11.06
申请号	US19470767529	申请日期	1947.07.30
申请人	OBERMAN ROELOF M M	发明人	OBERMAN ROELOF M. M.
分类号	B06B1/16;H04Q3/00	主分类号	B06B1/16
代理机构		代理人
主权项
地址

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