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| All Patents in class 359/892 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,104,179 | Jul. 21, 1914 | W.F. Folmer | Photographic Ray Filter | ||
| 2,353,898 | Jul. 18, 1944 | R.J. Nitsch | Filter and Heater Unit Holder Particularly for Aerial Cameras | ||