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经营范围
发明名称
Improvements in photographic exposure meters
摘要
申请公布号
GB361000(A)
申请公布日期
1931.11.19
申请号
GB19300024928
申请日期
1930.08.20
申请人
ERNEST BERTRAM
发明人
分类号
G01J1/40
主分类号
G01J1/40
代理机构
代理人
主权项
地址
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