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| All Patents in class 172/679 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 7,448 | Jun. 18, 1850 | J.F. Wood | Combination of a Guide-Tooth with an Inclined Scraper | |
| 911,703 | Feb. 09, 1909 | H.C. Clay | Gang Plow | ||