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| All Patents in class 222/578 | |||||
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| Number | Date | Patentee | Title | Type | |
| 76,409 | Apr. 07, 1868 | S. Darling | Improvement in inkstands | draftsman | |
| 366,206 | Jul. 12, 1887 | S. Darling | Inkstand | draftsman | |
| 369,101 | Aug. 30, 1887 | S. Darling | Inkstand | draftsman | |