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| Patents for William Hills | |||||
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| Number | Date | Patentee | Title | Type | |
| 409,456 | Aug. 20, 1889 | H.M. Darling | Feeding mechanism for lathes | engine lathes | |
| 436,306 | Sep. 09, 1890 | H.M. Darling | Cutting Tool | machine and tool cutters | |