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The ornamental design for a fountain pen, as shown and described.
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1. Fountain pen
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| D931935, | Jan 28 2020 | Writing and drawing instrument | |
| D931936, | Jan 28 2020 | Writing and drawing instrument | |
| D932547, | Jan 28 2020 | Writing and drawing instrument | |
| ER2538, |
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| 20090003918, | |||
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| D828448, | Feb 28 2017 | Fulon Development Limited | Pen |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
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| Date | Maintenance Schedule |