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发明名称
Photoelectric exposure meter
摘要
申请公布号
US2178197(A)
申请公布日期
1939.10.31
申请号
US19380237176
申请日期
1938.10.27
申请人
BING JOSEPH M
发明人
BING JOSEPH M.
分类号
G01J1/04;G01J1/06;G01J1/42
主分类号
G01J1/04
代理机构
代理人
主权项
地址
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