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| Patents for H. C. Johnson | |||||
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| Number | Date | Patentee | Title | Type | |
| 126,963 | May 21, 1872 | L.H. Hunt | Improvement in Countersinks | countersinks | |
| 502,316 | Aug. 01, 1893 | A.S. Petticrew | Automatic receding sawmill-setworks | sawmills | |