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The ornamental design for a ballpen, as shown and described.
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The two circles shown in broken lines in
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| D551709, | Oct 13 2005 | INOXCROM, S A | Pen |
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| D567287, | Mar 28 2006 | Anand International | Pen |
| D571400, | Dec 01 2006 | Anand International | Retractable pen |
| EM512480001, |
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