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| All Patents in class 403/323 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 459,361 | Sep. 08, 1891 | D.L. Gregory | Separable Square | |
 | 680,830 | Aug. 20, 1901 | J.A. Wray | Square | |
 | 822,016 | May 29, 1906 | J.A. Rankin | Square | |
 | 909,694 | Jan. 12, 1909 | L.V. Shepherd | Square | |
 | 1,049,299 | Dec. 31, 1912 | A.A. Harvie | Knockdown Carpenter's Square | |
 | 1,107,516 | Aug. 18, 1914 | H.E. Harris | Separable Square | |