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经营范围
发明名称
Improvements in or relating to sound recording
摘要
申请公布号
GB390839(A)
申请公布日期
1933.04.10
申请号
GB19310028202
申请日期
1931.10.10
申请人
BELL TELEPHONE LABORATORIES INCORPORATED
发明人
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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