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| All Patents in class 33/475 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 21,861 | Oct. 19, 1858 | L. Yale, Jr. | Square Adjustment | |
 | 296,157 | Apr. 01, 1884 | W.A. Gabriel | Try Square | |
 | 392,426 | Nov. 06, 1888 | R. Hayden | Try-Square | |
 | 707,301 | Aug. 19, 1902 | W. Chesterman | Engineer's Square | |
 | 761,929 | Jun. 07, 1904 | C.L. Weld | Try Square | |
| 2,126,896 | Aug. 16, 1938 | S. Koller | Angle Plate | ||
 | 4,096,634 | Jun. 27, 1978 | A. Gudel | Method and Device for the Measurement of Angles on Space Planes | |