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| Patents for Frederick O. Clark | |||||
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| Number | Date | Patentee | Title | Type | |
| 462,797 | Nov. 10, 1891 | D. Hazard | Attachment for gang-saw mills | sawmills | |
| 518,187 | Apr. 10, 1894 | D. Hazard | Saw Sharpening Machine | saw sharpening machines | |
| 521,343 | Jun. 12, 1894 | D. Hazard | Saw | handsaw teeth | |