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