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| All Patents in class 396/327 | |||||
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| Number | Date | Patentee | Title | Type | |
| 756,614 | Apr. 05, 1904 | W.F. Folmer | Camera | cameras | |
| 1,454,218 | May 08, 1923 | W.F. Folmer | Photographic Optical System | camera accessories | |