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| All Patents in class 91/170R | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,473,506 | Jun. 21, 1949 | E.P. Bullard | Positioning Device | ||
| 3,173,315 | Mar. 16, 1965 | J.A. Rave, Jr., H.M. Fuldner | Turret Drill | multiple spindle drill presses | |