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| Patents for Otto Freund Jr. | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,150,771 | Aug. 17, 1915 | W.L. Keuffel | Slide rule runner | slide rules | |
| 1,181,672 | May 02, 1916 | W.L. Keuffel | Slide rule runner | slide rules | |