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| Patents for David O. Prince | |||||
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| Number | Date | Patentee | Title | Type | |
| 402,079 | Apr. 23, 1889 | W.A. Dromgold, S.N. Hench | Spring-tooth harrow | harrows | |
| 419,990 | Jan. 21, 1890 | W.A. Dromgold, S.N. Hench | Spring-tooth harrow | harrows | |