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| Patents for Henry M. Clark | |||||
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| Number | Date | Patentee | Title | Type | |
| 195,480 | Sep. 25, 1877 | H.M. Clark | Improvement in Circular Planes | circular planes | |
| 195,481 | Sep. 25, 1877 | H.M. Clark | Improvement in Bench-Planes | circular planes | |