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| All Patents in class 172/423 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 79,639 | Jul. 07, 1868 | G.A. Davison | Wheel Plow | ||
 | 168,762 | Oct. 11, 1875 | L.H. McGinnes | Harrow | |
 | 2,090,324 | Aug. 17, 1937 | J. Boisvert | Road grader attachment | |