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| Patents for William R. Howell | |||||
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| Number | Date | Patentee | Title | Type | |
| 14,221 | Feb. 12, 1856 | W. Baxter | Diagonal Adjustable Wrench | nut wrenches | |
| RE7,689 | May 22, 1877 | C.S. Bonney | Improvement in Hollow Augers | hollow bits | |