Phonograph disk record,申请号US19280316807-传众专利搜索

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发明名称	Phonograph disk record
摘要
申请公布号	US1755743(A)	申请公布日期	1930.04.22
申请号	US19280316807	申请日期	1928.11.02
申请人	MORRISON EDGAR H	发明人	MORRISON EDGAR H.
分类号	G11B3/70	主分类号	G11B3/70
代理机构		代理人
主权项
地址

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