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| All Patents in class 221/293 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 447,144 | Feb. 24, 1891 | J.B. Clyne | Automatic Feed Mechanism for Chucks | ||
| 622,749 | Apr. 11, 1899 | S.L. Worsley | Feeding Attachment for Turret Lathes | ||
 | 1,651,976 | Dec. 06, 1927 | E.B. Stimpson | Rivet-setting machine | |
| 1,877,693 | Sep. 13, 1932 | C.A. Rich | Automatic Screw Machine | ||
| 2,911,763 | Nov. 10, 1959 | H.P. Kwapien, A.W. Todd | Work feeding mechanism for a centerless grinder | ||