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| All Patents in class 279/20.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,187,170 | Jan. 16, 1940 | J.R. O'Connell | Feed chuck | metal lathe chucks | |
| 2,221,734 | Nov. 12, 1940 | L.R. Evans | Means for feeding work in automatic screw machines | screwcutting lathes | |
| 2,310,259 | Feb. 09, 1943 | H.W. Ruppel | Stock feed for automatic screw machines | screw machines | |