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| Patents for Levi Heald | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,123 | Jun. 03, 1843 | L. Heald | Self-setting head and tail blocks for sawmills | sawmill tailblocks | |
| AI66 | Oct. 28, 1843 | L. Heald | Self-setting head and tail blocks for sawmills | sawmill headblocks | |