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| All Patents in class 409/33 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,123,717 | Jul. 12, 1938 | W.F. Dalzen | Gear Finishing Machine | ||
| 2,232,408 | Feb. 18, 1941 | S.M. Shaw | Gear Finishing Machine | ||
| 2,344,292 | Mar. 14, 1944 | J.C. Drader | Method of Finishing Gears | ||
| 2,504,578 | Apr. 18, 1950 | H. Pelphrey | Internal Gear Shaving Machine | ||
| 2,749,802 | Jun. 12, 1956 | W.R. Carsen | Shaving Cutter for Gears | ||
| 2,962,799 | Dec. 06, 1960 | A.D. Moncrieff | Gear Cutting Device | ||