Telephone subset current generator,申请号US19570674676-传众专利搜索

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发明名称	Telephone subset current generator
摘要
申请公布号	US2963552(A)	申请公布日期	1960.12.06
申请号	US19570674676	申请日期	1957.07.29
申请人	RALPH D. COLLINS	发明人	JR. CHANDOS A. RYPINSKI,
分类号	H04Q5/00	主分类号	H04Q5/00
代理机构		代理人
主权项
地址

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