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The ornamental design for a sound amplifier, as shown.
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FIG. 1 is a front view of a sound amplifier;
FIG. 2 is a rear view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof; and,
FIG. 6 is a bottom view thereof.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Dec 25 2000 | AMIYA, EIZO | Yamaha Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 011507 | /0448 | |
| Jan 31 2001 | Yamaha Corporation | (assignment on the face of the patent) | / |
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