Bell ringing apparatus,申请号US19380226890-传众专利搜索

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发明名称	Bell ringing apparatus
摘要
申请公布号	US2254326(A)	申请公布日期	1941.09.02
申请号	US19380226890	申请日期	1938.08.26
申请人	INTERNATIONAL PROJECTOR CORPORATION	发明人	SONTAGH JOHN R.
分类号	G03B21/43	主分类号	G03B21/43
代理机构		代理人
主权项
地址

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