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| All Patents in class 396/509 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 716,021 | Dec. 16, 1902 | W.F. Folmer | Photographic Camera | |
| 2,236,925 | Apr. 01, 1941 | O. Steiner | Automatic Diaphragm Adjusting Mechanism for Photographic Cameras | ||
| 2,550,698 | May 01, 1951 | E. Berlant, R.W. King | Automatic Reflex Camera with Diaphragm Adjustment and Flash Synchronizer Means | ||
| 2,821,891 | Feb. 04, 1958 | A.H. Gorey | Diaphragm for Photographic Cameras | ||