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| All Patents in class 409/242 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 110,951 | Jan. 17, 1871 | A.H. Brainard | Improvement in Back Centers for Milling Machines | |
 | 362,082 | May 03, 1887 | G.A. Mueller, F. Holz | Milling Machine | |
 | 470,245 | Mar. 08, 1892 | T.L. Smith, F. Kempsmith | Tail-stock for milling-machines | |
 | 491,521 | Feb. 14, 1893 | J.W. Boynton | Tail Stock for Milling Machines | |
 | 610,677 | Sep. 13, 1898 | C.L. Grohmann | Tail-stock for milling-machines | |
| 3,418,757 | Dec. 31, 1968 | J. McEwan | Lawn mower sharpener | ||