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| Patents for N. M. Johnson | |||||
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| Number | Date | Patentee | Title | Type | |
| 136,714 | Mar. 11, 1873 | I.J. Robinson, H. Fairbanks | Improvement in Carpenters' Bevels | bevels | |
| 153,115 | Jul. 14, 1874 | I.J. Robinson | Improvement in processes for tempering the blades of squares | carpenter squares | |