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| All Patents in class 359/449 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,222,165 | Nov. 19, 1940 | R.R. Finn, R.O. Beardsley | Comparator | comparators | |
| 2,525,596 | Oct. 10, 1950 | R.R. Finn | Optical Projection Screen | comparators | |