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| Patents for Isaac L. Penney | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 138,815 | May 13, 1873 | I.L. Penney | Improvement in lock-cutting machines | |
| 230,715 | Aug. 03, 1880 | I.L. Penney | Grinding Twist Drills | ||
 | 302,520 | Jul. 22, 1884 | I.L. Penney | Trip Hammer | |