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| All Patents in class 396/152 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 756,614 | Apr. 05, 1904 | W.F. Folmer | Camera | |
| 1,023,930 | Apr. 23, 1912 | W.F. Folmer | Photographic Camera | ||
| 1,023,931 | Apr. 23, 1912 | W.F. Folmer | Camera | ||
| 2,293,427 | Aug. 18, 1942 | L.D. Nadel | Reflex Focusing Hood with Cooperating Built-In Direct-Vision View Finder | ||
| 2,495,355 | Jan. 24, 1950 | R. Stahl | Focusing Mechanism for Twin Lens Reflex Camera | ||