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The ornamental design for a sound machine, as shown and described.
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The broken lines shown in the drawings depict portions of the sound machine in which the design is embodied that form no part of the claimed design.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Jan 18 2021 | SHENZHEN LIANHUA ELECTRONICS CO , LTD | HUMBOLDT TECHNOLOGY HK LIMITED | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 055035 | /0206 |
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