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The ornamental design for an amplifier, as shown and described. |
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FIG. 1 is a plan view of an amplifier showing my _new design.
FIG. 2 is a left side view thereof.
FIG. 3 is a rear elevational view thereof.
FIG. 4 is a top-right-front perspective view thereof.
FIG. 5 is a rear view thereof.
FIG. 6 is a bottom-left-rear view thereof.
FIG. 7 is a bottom view thereof.
The pattern of holes shown in FIGS. 4-6 covers the entire surface area.
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