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| Patents for James Hay | |||||
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| Number | Date | Patentee | Title | Type | |
| 108,326 | Oct. 18, 1870 | J.C. Butterfield, J. Hay | Improvement in trip-hammers | drop hammers | |
| RE4,470 | Jul. 18, 1871 | J.C. Butterfield, J. Hay | Improvement in trip-hammers | drop hammers | |