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| All Patents in class 33/121 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 218,802 | Aug. 19, 1879 | R.H. Hurlbut, S. Moore, J.H. Williams | Surface Measuring Machine | |
| 3,115,711 | Dec. 31, 1963 | R.A. Plante | Area Comparison Gage | ||
| 4,326,338 | Apr. 27, 1982 | R.A. Plante | Area Comparison Gage | ||