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| All Patents in class 33/424 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,413X | Dec. 04, 1821 | G.H. Thompson | Protractors | protractors | |
| 17,106 | Apr. 21, 1857 | A. McKenzie | Combined Square, Miter Square, and Bevel | miter squares | |
| 29,133 | Jul. 17, 1860 | S. Barnett | Plotting Instrument | ||
| 53,397 | Mar. 27, 1866 | W.W. Branch, Jr. | Combination Bevel and Protractor | bevels | |
| 70,966 | Nov. 19, 1867 | J.E. Cowdery | Try-Square | try squares | |
| 535,717 | Mar. 12, 1895 | J. McLean | Combination Square Bevel | bevels | |