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