Improvements in and relating to sound producing devices,申请号GB19300009102-传众专利搜索

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发明名称	Improvements in and relating to sound producing devices
摘要
申请公布号	GB351057(A)	申请公布日期	1931.06.22
申请号	GB19300009102	申请日期	1930.03.21
申请人	THE WESTINGHOUSE BRAKE AND SAXBY SIGNAL COMPANY LIMITED	发明人
分类号	G10K9/02;G10K9/04	主分类号	G10K9/02
代理机构		代理人
主权项
地址

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