Water key for brass musical instruments,申请号US19450615393-传众专利搜索

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发明名称	Water key for brass musical instruments
摘要
申请公布号	US2439997(A)	申请公布日期	1948.04.20
申请号	US19450615393	申请日期	1945.09.10
申请人	EARL WILLIAMS	发明人	WILLIAMS EARL
分类号	G10D7/10	主分类号	G10D7/10
代理机构		代理人
主权项
地址

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