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| All Patents in class 91/407 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,397,814 | Apr. 02, 1946 | H.J. Caldwell, S.F. Manning, E.Y. Seborg | Honing machine | honing machines | |
| 2,454,235 | Nov. 16, 1948 | E.J. Tomek | Drilling machine | multiple spindle drill presses | |