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The ornamental design for a dental appliance, as shown.
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Apr 27 2018 | CHEN, YONG | SHANGHAI MUGANG MEDICAL TECHNOLOGY LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 046039 | 0824 | |
Apr 30 2018 | SHANGHAI MUGANG MEDICAL TECHNOLOGY LTD. | (assignment on the face of the patent) |
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