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| All Patents in class 29/DIG.72 | |||||
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| Number | Date | Patentee | Title | Type | |
| 122,702 | Jan. 16, 1872 | O.C. Burton | Improvement in Machines for Cutting Threads on Bolts | metal threading machines | |
| 465,376 | Dec. 15, 1891 | A. Johnston | Means for Grinding Cutlery or Other Articles | sharpening apparatus | |