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| All Patents of Type: slide rules | |||||
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| Number | Date | Patentee | Title | Type | |
| 450,640 | Apr. 21, 1891 | R.C. Smith | Slide Rule for Logarithmic Calculations | slide rules | |
| 1,934,232 | Nov. 07, 1933 | A.W. Keuffel | Slide rule | slide rules | |