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21.Photoelectric camera exposure control apparatus having planetary gears and concentric camera lens 失效
Title translation: 具有行星齿轮和同心相机镜头的光电相机曝光控制装置公开(公告)号:US2467946A
公开(公告)日:1949-04-19
申请号:US64807846
申请日:1946-02-16
Applicant: ROSSMANN PETER F , KARL RATH
Inventor: ROSSMANN PETER F , KARL RATH
IPC: G03B7/06
CPC classification number: G03B7/06
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