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| All Patents of Type: honing machines | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,240,440 | Apr. 29, 1941 | J.H. Hoern | Apparatus for Honing Internal Screw Threads | honing machines | |
| 2,419,136 | Apr. 15, 1947 | A.F. Hasty | Honing Mandrel | honing machines | |