-
1.Apparatus for determining proper contrast-grade of photosensitive paper and exposure time in making photographic prints 失效
Title translation: 用于确定感光纸的正确对比度等级和制作照相印刷品的曝光时间的装置公开(公告)号:US2795168A
公开(公告)日:1957-06-11
申请号:US58753656
申请日:1956-05-28
Applicant: BAUER BENJAMIN B
Inventor: BAUER BENJAMIN B
IPC: G01J1/12
CPC classification number: G01J1/126
-
2.Optical comparison exposure meter used in photographic enlarging or reproducing work 失效
Title translation: 用于摄影放大或再现工作的光学比较曝光表公开(公告)号:US2493673A
公开(公告)日:1950-01-03
申请号:US76662447
申请日:1947-08-06
Applicant: LASZLO KALMAN
Inventor: LASZLO KALMAN
-
公开(公告)号:US3187652A
公开(公告)日:1965-06-08
申请号:US11460
申请日:1960-01-04
Applicant: KINNARD WOLCOTT S
Inventor: KINNARD WOLCOTT S
IPC: G01J1/12
CPC classification number: G01J1/126
-
-