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| All Patents in class 451/470 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,240,440 | Apr. 29, 1941 | J.H. Hoern | Apparatus for Honing Internal Screw Threads | ||
| 2,419,136 | Apr. 15, 1947 | A.F. Hasty | Honing Mandrel | ||
| 2,596,961 | May 13, 1952 | J.F. Smole | Honing tool | ||
| 2,663,124 | Dec. 22, 1953 | A. Collier, J.F. Smole | Expandable hone | ||
 | 2,713,758 | Jul. 26, 1955 | C.F. Norkus | Boring Bars | |
| 3,154,893 | Nov. 03, 1964 | K.H. Casson, D.K. Greenberg | Honing element | ||
| 5,050,352 | Sep. 24, 1991 | M.R. Estabrook, C.R. Van Sickle | Honing stone assembly | ||