Bell ringing device,申请号US19490108257-传众专利搜索

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发明名称	Bell ringing device
摘要
申请公布号	US2512912(A)	申请公布日期	1950.06.27
申请号	US19490108257	申请日期	1949.08.03
申请人	RAOUL BLACKBURN	发明人	BLACKBURN RAOUL
分类号	G10K1/34	主分类号	G10K1/34
代理机构		代理人
主权项
地址

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