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| All Patents in class 451/233 | |||||
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| Number | Date | Patentee | Title | Type | |
| 409,024 | Aug. 13, 1889 | S.M. Dixon | Machine for cutting curved surfaces | barrel making machines | |
| 921,091 | May 11, 1909 | M. de Tamble | Feed mechanism for automatic carving-machines | carving machines | |
| 2,625,772 | Jan. 20, 1953 | J.C. Moore | Machine for sharpening pipe wrench jaws | sharpening machines | |