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发明名称
Improvements in photo-electric exposure meters
摘要
申请公布号
GB504786(A)
申请公布日期
1939.04.25
申请号
GB19370029126
申请日期
1937.10.25
申请人
HANS FERDINAND TONNIES
发明人
分类号
G01J1/04;G01J1/06
主分类号
G01J1/04
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