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| Patents for Henry Howson | |||||
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| Number | Date | Patentee | Title | Type | |
| 968,372 | Aug. 23, 1910 | G.O. Leopold | Ball-bearing | tool making machines | |
| 982,510 | Jan. 24, 1911 | G.O. Leopold | Ratchet mechanism | eggbeater drills | |