Piston valve for wind instruments,申请号US19300439097-传众专利搜索

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发明名称	Piston valve for wind instruments
摘要
申请公布号	US1821397(A)	申请公布日期	1931.09.01
申请号	US19300439097	申请日期	1930.03.26
申请人	F. E. OLDS & SON, INC.	发明人	OLDS REGINALD B.
分类号	G10D9/04	主分类号	G10D9/04
代理机构		代理人
主权项
地址

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