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| All Patents in class 172/632 | |||||
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| Number | Date | Patentee | Title | Type | |
| 16,933 | Mar. 31, 1857 | J.E. Morgan | Improvement in Harrows | harrows | |
| 120,195 | Oct. 24, 1871 | E.W. Herendeen | Improvement in harrows | harrows | |