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| Patents for J. J. Johnston | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 98,037 | Dec. 21, 1869 | W.S. Colwell | Improvement in device for conveying sawdust from saws | |
 | 571,366 | Nov. 17, 1896 | R. Hegarty | Measuring Pole | |
 | 595,475 | Dec. 14, 1897 | R. Hegarty | Measuring Pole | |