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| All Patents in class 33/531 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 79,032 | Jun. 16, 1868 | D.H. Tierney | Bevel & Tapering Gauge | |
 | 1,254,218 | Jan. 22, 1918 | H. Eskelinen | Measuring Instrument | |
| 1,398,296 | Nov. 29, 1921 | J.J. Provost, C.J. Goguen | Micrometer Taper-Gage | ||
 | 3,230,630 | Jan. 25, 1966 | G.L. Gershman | Internal taper micrometer | |
 | 4,206,548 | Jun. 10, 1980 | P. Bergman | Measuring Tool for Taper Bores | |
 | 4,718,172 | Jan. 12, 1988 | A.J. Partington, M.J. Rouse | Turbine Blade Radial Position Gage | |