File:Braille Model 4081-3 slide rule-IMG 5835-gradient.jpg
![File:Braille Model 4081-3 slide rule-IMG 5835-gradient.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/8/85/Braille_Model_4081-3_slide_rule-IMG_5835-gradient.jpg/800px-Braille_Model_4081-3_slide_rule-IMG_5835-gradient.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:16, 11 April 2020 | ![]() | 6,600 × 4,400 (1.18 MB) | Rama | |
18:08, 11 April 2020 | ![]() | 6,600 × 4,400 (1.3 MB) | Rama | {{Information |Description = Keuffel & Esser Model 4081-3 Braille rule, developped in collaboration with the American Foundation for the Blind, early 1950s. On display at the MIT Museum. |Source = {{own}} |Date = |Author = {{u|Rama}} |Permission = {{self|Cc-by-sa-3.0-fr|Cc-by-sa-2.0-fr|CeCILL|attribution=Rama}} |other_versions = }} Category:MIT Slide Rule Collection Category:Keuffel and Esser |
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