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| All Patents in class 33/425 | |||||
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| Number | Date | Patentee | Title | Type | |
| AI280 | May 15, 1860 | J. Lyman | Protractor | protractors | |
| 433,084 | Jul. 29, 1890 | D.J. Kelsey | Protractor | protractors | |
| 490,121 | Jan. 17, 1893 | H.J. Leighton | Protractor Bevel | bevels | |
| 587,637 | Aug. 03, 1897 | E. Bausch | Prism gage | ||
| 744,963 | Nov. 24, 1903 | C.T. Frantz | Machinist's Protractor | protractors | |
| 776,817 | Dec. 06, 1904 | F.E. Vandercook | Protractor | protractors | |
| 924,675 | Jun. 15, 1909 | W.H. Krueger, C.E. Krueger | Combination Gage and Bevel Square | bevel squares | |