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发明名称
Sound-pick-up device
摘要
申请公布号
US1792323(A)
申请公布日期
1931.02.10
申请号
US19300432220
申请日期
1930.02.28
申请人
GENERAL ELECTRIC COMPANY
发明人
ROBINSON LEWIS T.
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
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地址
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