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| Patents for Daniel R. Hart | |||||
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| Number | Date | Patentee | Title | Type | |
| 370,255 | Sep. 20, 1887 | D.R. Hart | Screw Driver | screwdriver blades | |
| 417,722 | Dec. 24, 1889 | D.R. Hart | Screw Driver | screwdriver blades | |