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The ornamental design for a whistle, as shown and described.
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1. Whistle
| Patent | Priority | Assignee | Title |
| Patent | Priority | Assignee | Title |
| 3924560, | |||
| D420929, | Jul 22 1994 | Mark A, Vigil | Hockey stick duck call |
| D601625, | Apr 03 2009 | Whistle pen | |
| D724059, | Mar 12 2013 | Samsung Electronics Co., Ltd. | Remote controller |
| D782355, | Jul 09 2015 | WOOJIN PLASTIC CO., LTD | Curved whistle |
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