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| Patents for Harold Ferrell | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 132,058 | Oct. 08, 1872 | D. Cumming, Jr. | Improvement in Attachment for Wrenches | |
 | 179,494 | Jul. 04, 1876 | J.J. Tower | Improvement in Bench-Planes | |
 | CA-45,993 | May 09, 1894 | C. Hall | Pipe-Wrench | |