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经营范围
发明名称
Apparatus for recording and/or reproducing sound
摘要
申请公布号
US1925608(A)
申请公布日期
1933.09.05
申请号
US19290388396
申请日期
1929.08.26
申请人
MARCONI'S WIRELESS TELEGRAPH COMPANY, LIMITED
发明人
ROUND HENRY JOSEPH
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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