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| Patents for H. A. Mitchell | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,266,010 | May 14, 1918 | C.F. Golden | Compass | ||
| 1,269,506 | Jun. 11, 1918 | E. Preston | Grinder | ||
| 1,341,193 | May 25, 1920 | R.H. Owen | Pliers | pliers | |