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Type | Model No. | Maker | Country | Construction Material | Date | Scale Length | Area of Use |
Polar | K&E Model 4212 | Keuffel & Esser | USA | German silver | 1892-1938 | N/A | General area measurement |
Notes: "This is an early-style K&E 4212 polar planimeter, a model that had a very long run in the K&E catalogs, from 1892 (when it was known as the model 1111) until 1938. When it was first offered, the model 1111 was an upgrade from the model 1110, adding a multiplier disc."
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