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The ornamental design for the sound amplifier, as shown and described.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Apr 03 2012 | MARKLUND, EMIL | LAB GRUPPEN AB | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 027990 | /0247 | |
| Apr 04 2012 | LAB.GRUPPEN AB | (assignment on the face of the patent) | / | |||
| Aug 19 2015 | LAB GRUPPEN AB | MUSIC GROUP INNOVATION SWEDEN AB | CHANGE OF NAME SEE DOCUMENT FOR DETAILS | 039250 | /0280 | |
| Jul 01 2016 | MUSIC GROUP INNOVATION SWEDEN AB | MUSIC GROUP IP LTD | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 039275 | /0734 |
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