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| All Patents in class 352/109 | |||||
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| Number | Date | Patentee | Title | Type | |
| 588,916 | Aug. 24, 1897 | E.F. Frost, W.G. Steward | Kinetoscope | audio-visual apparatus | |
| 3,212,839 | Oct. 19, 1965 | H.K. Graves | Optical Rectifier | projectors | |