Protective device for relay contacts,申请号US19470737881-传众专利搜索

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发明名称	Protective device for relay contacts
摘要
申请公布号	US2491272(A)	申请公布日期	1949.12.13
申请号	US19470737881	申请日期	1947.03.28
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	KNAPP HARRY M.
分类号	H01H50/02	主分类号	H01H50/02
代理机构		代理人
主权项
地址

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