Sound reproducer for talking motion pictures,申请号US19300436141-传众专利搜索

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发明名称	Sound reproducer for talking motion pictures
摘要
申请公布号	US1938805(A)	申请公布日期	1933.12.12
申请号	US19300436141	申请日期	1930.03.15
申请人	BURT ROBERT C	发明人	BURT ROBERT C.
分类号	G03B31/00	主分类号	G03B31/00
代理机构		代理人
主权项
地址

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