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| Patents for Henry H. McDougall | |||||
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| Number | Date | Patentee | Title | Type | |
| 248,550 | Oct. 18, 1881 | G.C. Avery | Machine for cutting or dressing plow-handles | specialty woodworking machines | |
| 252,712 | Jan. 24, 1882 | G.C. Avery | Bending plow-handles | wood bending machines | |