Portable rear seat speaker,申请号US19550497657-传众专利搜索

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发明名称	Portable rear seat speaker
摘要
申请公布号	US2769858(A)	申请公布日期	1956.11.06
申请号	US19550497657	申请日期	1955.03.29
申请人	STEFFEN ALVIN H	发明人	STEFFEN ALVIN H.
分类号	H04R1/02	主分类号	H04R1/02
代理机构		代理人
主权项
地址

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