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| All Patents in class 396/440 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,829,332 | Oct. 27, 1931 | A.H. Beck | Method of and Apparatus for Holding Photographic Films in Flat Position During Exposure | ||
| 2,362,813 | Nov. 14, 1944 | E.S. Hineline, L.D. Nadel, A.H. Gorey | Photographic Camera Particularly Adapted for Aerial Photography | ||