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| All Patents in class 33/424 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 3,413X | Dec. 04, 1821 | G.H. Thompson | Protractors | |
 | 17,106 | Apr. 21, 1857 | A. McKenzie | Combined Square, Miter Square, and Bevel | |
 | 29,133 | Jul. 17, 1860 | S. Barnett | Plotting Instrument | |
 | 53,397 | Mar. 27, 1866 | W.W. Branch, Jr. | Combination Bevel and Protractor | |
 | 70,966 | Nov. 19, 1867 | J.E. Cowdery | Try-Square | |
 | 535,717 | Mar. 12, 1895 | J. McLean | Combination Square Bevel | |
 | 894,832 | Aug. 04, 1908 | E.H. Horton | Try and Bevel Square | |