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| Patents for Robert J. Pratt | |||||
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| Number | Date | Patentee | Title | Type | |
| 384,928 | Jun. 19, 1888 | R.J. Pratt | Drill Chuck | metal lathe chucks | |
| 417,093 | Dec. 10, 1889 | J. Robison | Brush attachment for sawing-machines | metal sawing machines | |