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| Title | Maker | Date Made | |
| Landolt's Double Prisme & case | L. Giroux | c.1920s? | View |
| variable prism | 20th c. | View | |
| variable prism disc | Mid-Late 20th c. | View | |
| variable prism disc | Mid 20th c. | View | |
| variable prism disc | Theodore Hamblin Ltd | Mid 20th c. | View |