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| All Patents in class 279/20.1 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,069,775 | Feb. 09, 1937 | C.A. Rich | Feed Collet | ||
 | 2,187,170 | Jan. 16, 1940 | J.R. O'Connell | Feed chuck | |
 | 2,221,734 | Nov. 12, 1940 | L.R. Evans | Means for feeding work in automatic screw machines | |
 | 2,310,259 | Feb. 09, 1943 | H.W. Ruppel | Stock feed for automatic screw machines | |
| 2,343,570 | Mar. 07, 1944 | A.W. Nelson | Chucking Device for Use in Screw and Similar Machines | ||
| 2,606,033 | Aug. 05, 1952 | H.S. Sizer | Machine-Tool Feed Finger | ||