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| Item# | Type | Model No. | Match No. | Variant No. | Model Name | Maker | Country | Production or Serial No. | Material | Scale Length | Date | Condition |
| KEU659 | Cylindrical | N4012 | 4006 | n/a | Thacher Calculator | Keuffel & Esser | USA | 6582 | Brass with paper scales | "18" | 1945 | C4 |
Notes: "Cylinder mounted inside a cage with paper scales, brass stand, and mahogany base. Resolution of calculations equivalent to a linear slide rule 720" long. This model has the range of each scale labeled on each end."
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