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| All Patents in class 235/70B | |||||
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| Picture | Number | Date | Patentee | Title | |
| 540,184 | May 28, 1895 | T. Norris | Markre for Slide Rules | ||
 | 1,150,771 | Aug. 17, 1915 | W.L. Keuffel | Slide rule runner | |
 | 1,181,672 | May 02, 1916 | W.L. Keuffel | Slide rule runner | |