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| Patents for William C. Hard | |||||
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| Number | Date | Patentee | Title | Type | |
| 45,981 | Jan. 24, 1865 | W.H. Doane | Improvement in scroll-saws | scrollsaws | |
| 48,161 | Jun. 13, 1865 | W.H. Doane | Improvement in scroll-sawing machines | scrollsaws | |
| 49,584 | Aug. 22, 1865 | W.H. Doane | Improved journal-box | wood planers | |
| 68,791 | Sep. 10, 1867 | W.H. Doane, J. Richards | Improvement in mortising machines | mortising machines | |