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发明名称
Neutral density filter screen
摘要
申请公布号
US2628534(A)
申请公布日期
1953.02.17
申请号
US19510218968
申请日期
1951.04.03
申请人
WARNER BROS. PICTURES, INC.
发明人
GIBBONS JAMES A.
分类号
G03B21/60
主分类号
G03B21/60
代理机构
代理人
主权项
地址
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