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| Patents for Bowdersine B. Van Sickle | |||||
| Picture | Number | Date | Patentee | Title | |
![]() | 1,150,771 | Aug. 17, 1915 | W.L. Keuffel | Slide rule runner | |
![]() | 1,181,672 | May 02, 1916 | W.L. Keuffel | Slide rule runner | |