Synthetic tone signal,申请号US19330674070-传众专利搜索

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发明名称	Synthetic tone signal
摘要
申请公布号	US2074875(A)	申请公布日期	1937.03.23
申请号	US19330674070	申请日期	1933.06.02
申请人	SCHWARZE ELECTRIC COMPANY	发明人	VOIGTLANDER FREDERICK VON
分类号	B06B1/02	主分类号	B06B1/02
代理机构		代理人
主权项
地址

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