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| Patents for Hartford Tool Co. | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 243,770 | Jul. 05, 1881 | J.E. Woodbridge, F.N. Gardner | Holder for Grinding Tools | |
 | 256,668 | Apr. 18, 1882 | F.N. Gardner | Cutter Holder for Lathes | |
 | 262,878 | Aug. 15, 1882 | J.E. Woodbridge | Metal Turning Tool | |
 | 349,840 | Sep. 28, 1886 | F.N. Gardner | Drafting Compass | |
 | 390,604 | Oct. 02, 1888 | M.C. Johnson | Lathe-tool | |