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| Patents for Mackintosh, Hemphill & Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 73,505 | Jan. 21, 1868 | W.S. Colwell | Improvement in stave-machines | cooper | |
| 794,537 | Jul. 11, 1905 | S. McMillen | Truing guide-surfaces of planers, &c. | metal planers | |
| 807,634 | Dec. 19, 1905 | S. McMillen | Planer | metal planers | |