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The ornamental design for an adjustable dumbbell, as shown and described.
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FIG. 1 is a perspective view of the adjustable dumbbell of the present invention;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
Golesh, Eric D., Flick, Edward L., Crawford, Douglas A., Rauwerdink, Matthew
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