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发明名称
Improvements in or relating to sound records
摘要
申请公布号
GB340099(A)
申请公布日期
1930.12.24
申请号
GB19290034962
申请日期
1929.11.15
申请人
ARTHUR D. LITTLE, INCORPORATED;HOWARD JAMES BILLINGS
发明人
分类号
G11B3/70
主分类号
G11B3/70
代理机构
代理人
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地址
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