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