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| All Patents in class 356/391 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,035,780 | Mar. 31, 1936 | R.R. Finn, E.T. Bysshe, R.O. Beardsley | Comparator | comparators | |
| 2,484,103 | Oct. 11, 1949 | R.E. Lewis | Projection Comparator for Objects in Relation to Spaced Drawings or Reticles | comparators | |
| 2,521,820 | Sep. 12, 1950 | L.B. Fuller, R.O. Beardsley | Optical Comparator for Testing Cams | comparators | |