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| All Patents in class 101/421 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,716 | Aug. 23, 1844 | A. Gilman | Improvement in Pritnting Presss | printer | |
| 5,188 | Jul. 10, 1847 | R.M. Hoe | Improvement in printing-presses | printer | |