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1.Photographic light comparator for determining diaphragm adjustment 失效
Title translation: 用于确定光圈调节的照相光比较器公开(公告)号:US2649017A
公开(公告)日:1953-08-18
申请号:US16745850
申请日:1950-06-10
Applicant: MCCARTY HARRY D
Inventor: MCCARTY HARRY D
IPC: G01J1/12
CPC classification number: G01J1/124