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| Patents for H. Chapin | |||||
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| Number | Date | Patentee | Title | Type | |
| 125,823 | Apr. 16, 1872 | J.A. Marden | Butt Gage | butt gauges | |
| 178,354 | Jun. 06, 1876 | M. Wilcox | Improvement in Spirit Levels | levels | |