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| Patents for Guilford Iron Works | |||||
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| Number | Date | Patentee | Title | Type | |
| 32,449 | May 28, 1861 | N.R. Merchant | Improvement in boring-machines | cooper | |
| 121,555 | Dec. 05, 1871 | J.S. Teed | Improvement in water-wheels | water wheels | |
| RE5,222 | Jan. 07, 1873 | N.R. Merchant | Improvement in boring-machines | cooper | |
| 177,652 | May 23, 1876 | A.P. Merchant | Improvement in doweling-machines | wood drilling and boring | |