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| Patents for John Hewitt | |||||
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| Number | Date | Patentee | Title | Type | |
| 38,488 | May 12, 1863 | F.G. Jenkins | Improved cutter-head for wood of lead pencils | cutterheads | |
| 345,988 | Jul. 20, 1886 | F.V. Phillips | Supporting device for sliding doors | ||
| 347,507 | Aug. 17, 1886 | F.V. Phillips | Sash-cord guide | ||