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| All Patents in class 172/423 | |||||
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| Number | Date | Patentee | Title | Type | |
| 79,639 | Jul. 07, 1868 | G.A. Davison | Wheel Plow | plows | |
| 2,090,324 | Aug. 17, 1937 | J. Boisvert | Road grader attachment | graders and dozers | |