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The ornamental design for an audio signal amplifier, as shown.
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FIG. 1 is a perspective view of the top, front and right side of an audio signal amplifier showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
Akiyama, Takashi, Nakajima, Kazuhito
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Apr 18 2003 | NAKAJIMA, KAZUHITO | Yamaha Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 014123 | /0476 | |
| Apr 18 2003 | AKIYAMA, TAKASHI | Yamaha Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 014123 | /0476 | |
| May 28 2003 | Yamaha Corporation | (assignment on the face of the patent) | / |
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