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经营范围
发明名称
Combined electrical recorder and reproducer for phonographs
摘要
申请公布号
US1816831(A)
申请公布日期
1931.08.04
申请号
US19300466902
申请日期
1930.07.10
申请人
THOMAS A. EDISON, INCORPORATED
发明人
DUNNING ORVILLE M.
分类号
G11B3/46
主分类号
G11B3/46
代理机构
代理人
主权项
地址
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