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| Patents for H. O. Hamlin | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 138,639 | May 06, 1873 | H. Gould | Improvement in Belt-Lacing Gages | |
 | 138,815 | May 13, 1873 | I.L. Penney | Improvement in lock-cutting machines | |