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The ornamental design for a speaker box with built in amplifier, as shown. |
FIG. 1 is a top, front, and right-side perspective view of a speaker box with built in amplifier, showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left-side elevational view thereof;
FIG. 5 is a right-side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Jul 19 1990 | YAMAZAKI, AKIRA | Sony Corporation | ASSIGNMENT OF ASSIGNORS INTEREST | 005393 | /0710 | |
Jul 31 1990 | Sony Corporation | (assignment on the face of the patent) | / |
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