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| All Patents in class 15/423 | |||||
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| Number | Date | Patentee | Title | Type | |
| 73,956 | Feb. 04, 1868 | S. Darling | Improved Pen Cleaner | draftsman | |
| 370,379 | Sep. 27, 1887 | S. Darling | Pen Cleaner | draftsman | |