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The ornamental design for a bubble machine, as shown and described.
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The broken lines depict portions of the bubble machine that form no part of the claimed design.
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| D978975, | Aug 04 2021 | SHANTOU JIANHUI TOYS INDUSTRIAL CO , LTD | Watermelon bubble machine |
| D978976, | Aug 04 2021 | SHANTOU JIANHUI TOYS INDUSTRIAL CO , LTD | Soccer ball bubble machine |
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