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| Patents for Otis R. Angell | |||||
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| Number | Date | Patentee | Title | Type | |
| 977,258 | Nov. 29, 1910 | O.R. Angell | Combined valve grinder and drill | eggbeater drills | |
| 1,395,787 | Nov. 01, 1921 | O.R. Angell | Edge Setting and Burnishing Machine | shoemaking | |