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| Patents for Donn J. Twitchell | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 181,227 | Aug. 15, 1876 | H.W. Warner | Construction of Axes | |
 | 184,311 | Nov. 14, 1876 | H.W. Warner | Manufacture of Axes | |
 | 206,733 | Aug. 06, 1878 | H.H. Hill | Wrench | |
 | 213,916 | Apr. 01, 1879 | S.W. Martin | Ratchet-Wrench | |