Movable key device for musical instruments having keys,申请号US19320629567-传众专利搜索

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发明名称	Movable key device for musical instruments having keys
摘要
申请公布号	US1901214(A)	申请公布日期	1933.03.14
申请号	US19320629567	申请日期	1932.08.20
申请人	EDGAR WILLEMS	发明人	WILLEMS EDGAR
分类号	G10C3/12	主分类号	G10C3/12
代理机构		代理人
主权项
地址

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