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| Patents for Thomas Douglass | |||||
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| Number | Date | Patentee | Title | Type | |
| 121,934 | Dec. 19, 1871 | T. Douglass | Improvement in head-blocks | sawmill headblocks | |
| 123,091 | Jan. 30, 1872 | T. Douglass | Improvement in head-blocks | sawmill headblocks | |