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The ornamental design for a bubble machine, as shown and described.
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The broken lines are environmental structures and form no part of the claimed design.
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Sep 11 2018 | XU, GEN-HUA | SHENZHEN CONGLI ELECTRONICS CO , LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 046861 | 0422 | |
Sep 13 2018 | SHENZHEN CONGLI ELECTRONICS CO., LTD. | (assignment on the face of the patent) |
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