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