Electromagnetic switching device,申请号US19290385865-传众专利搜索

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发明名称	Electromagnetic switching device
摘要
申请公布号	US1844121(A)	申请公布日期	1932.02.09
申请号	US19290385865	申请日期	1929.08.14
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	HIBBARD FRANK H.
分类号	H01H47/22;H01H50/46	主分类号	H01H47/22
代理机构		代理人
主权项
地址

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