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| All Patents in class 172/643 | |||||
| Number | Date | Patentee | Title | Type | |
| 402,079 | Apr. 23, 1889 | W.A. Dromgold, S.N. Hench | Spring-tooth harrow | harrows | |
| 555,699 | Mar. 03, 1896 | W.A. Dromgold, S.N. Hench | Harrow | harrows | |