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发明名称
PHOTOGRAPHIC TONE CORRECTION MASK
摘要
申请公布号
CA417981(A)
申请公布日期
1944.01.25
申请号
CAD417981
申请日期
申请人
CANADIAN KODAK COMPANY
发明人
RALPH M. EVANS;WESLEY T. HANSON, JR.
分类号
主分类号
代理机构
代理人
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