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The ornamental design for a personal air filter, as shown and described.
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The broken lines in the drawings illustrate portions of the personal air filter which form no part of the claimed design.
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Apr 12 2021 | JIANG, YANTING | GUANGZHOU NEWSUO ENVIRONMENT PROTECTION EQUIPMENT CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 055922 | /0469 | |
Apr 14 2021 | Guangzhou Newsuo Environment Protection Equipment Co., Ltd. | (assignment on the face of the patent) | / |
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