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The ornamental design for a guitar amplifier, as shown and described.
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The broken line showing of the guitar amplifier is included for the purpose of illustrating portions of the guitar amplifier and forms no part of the claimed design.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Sep 09 2015 | SUZUKI, TOSHIHIDE | Yamaha Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 037340 | /0591 | |
Dec 21 2015 | Yamaha Corporation | (assignment on the face of the patent) | / |
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