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The ornamental design for a ballpoint pen, as shown and described.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Apr 26 2013 | LOSEL, HELMUT | Ritter-Pen GmbH | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 033495 | /0173 | |
May 13 2013 | Ritter-Pen GmbH | (assignment on the face of the patent) | / |
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