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The ornamental design for an audio amplifier, as shown and described.
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The broken line showing of the audio amplifier is included for the purpose of illustrating portions of the audio amplifier and forms no part of the claimed design.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Feb 02 2016 | OHMACHI, TAKENORI | Yamaha Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 037767 | /0134 | |
Feb 18 2016 | Yamaha Corporation | (assignment on the face of the patent) | / |
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