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| Patents for Allen Johnston | |||||
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| Picture | Number | Date | Patentee | Title | |
| 465,376 | Dec. 15, 1891 | A. Johnston | Means for Grinding Cutlery or Other Articles | ||
| 465,478 | Dec. 22, 1891 | A. Johnston | Grinding Machine | ||
| 485,697 | Nov. 08, 1892 | A. Johnston | Art of Grinding Cutlery or Other Tempered Steel Articles | ||