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| All Patents in class 409/220 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,350,617 | Oct. 31, 1967 | J. Firth | Positioning Device for Use on Machine Tools | metalworking machine mechanisms | |
| 3,469,497 | Sep. 30, 1969 | W.L. McCann | Multiple Table Swiveling Work Support | metalworking machine mechanisms | |