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Type | Model No. | Maker | Country | Construction Material | Date | Scale Length | Area of Use |
Linear | K & E /40701T | Keuffel & Esser | USA | Celluloid over wood | 1913-1915 | 25 cm | Engineering |
Notes: "Keuffel & Esser described the 4071T in their catalog as “Duplex Slide Rule, 10 in., like No. 4071 but with trig. scales.” True enough, this duplex slide rule has S and T scales. The column (or pillar) cursor dates it to 1913-1915. "
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