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发明名称
Improvements in masks for use in conjunction with photographic view finders
摘要
申请公布号
GB386353(A)
申请公布日期
1933.01.19
申请号
GB19310024193
申请日期
1931.08.28
申请人
CONRAD JOSEPH BECK
发明人
分类号
G03B13/02
主分类号
G03B13/02
代理机构
代理人
主权项
地址
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