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发明名称
Vignetter for cameras
摘要
申请公布号
US2193333(A)
申请公布日期
1940.03.12
申请号
US19390254879
申请日期
1939.02.06
申请人
HEWARD FREDERICK R
发明人
HEWARD FREDERICK R.
分类号
G03B19/26
主分类号
G03B19/26
代理机构
代理人
主权项
地址
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