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| All Patents in class 33/31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 60,609 | Dec. 18, 1866 | H.M. Albee | Improvement in ellipsographs | ||
| 1,134,806 | Apr. 06, 1915 | W.H. Barron, Jr., C. Leseman | Combination Trammels and Marking Gage | trammels | |
| 1,422,345 | Jul. 11, 1922 | W. Douglas | Ellipse Drawing Tool | trammels | |