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发明名称
Electromagnetic light-modulating device
摘要
申请公布号
US1794513(A)
申请公布日期
1931.03.03
申请号
US19300424839
申请日期
1930.01.31
申请人
METROGOLDWYN-MAYER CORPORATION
发明人
CECCARINI OLINDO O.
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
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