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| All Patents in class 396/140 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,302,584 | Nov. 17, 1942 | O. Steiner | Combined Range and View Finder Having Parallax Correcting Means | ||
| 2,717,543 | Sep. 13, 1955 | C.B. McCathron | Combined Range and View Finder for Cameras | ||
| 2,888,868 | Jun. 02, 1959 | R.L. Dalton, O. Steiner | Parallax Compensating Mechanism for Photographic Cameras | ||