Valve unit for player pianos,申请号US19280272470-传众专利搜索

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发明名称	Valve unit for player pianos
摘要
申请公布号	US1820037(A)	申请公布日期	1931.08.25
申请号	US19280272470	申请日期	1928.04.24
申请人	WATSON WILLIAM A	发明人	WATSON WILLIAM A.
分类号		主分类号
代理机构		代理人
主权项
地址

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