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The ornamental design for an ab crunch back extension exercise machine, as shown and described. |
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FIG. 1 is a front view of the ab crunch back extension exercise machine in accordance with the present invention;
FIG. 2 is a left side view of the present invention;
FIG. 3 is a back view of the present invention;
FIG. 4 is a right side view of the present invention;
FIG. 5 is a top view of the present invention;
FIG. 6 is a front perspective view of the present invention; and,
FIG. 7 is a back perspective view of the present invention.
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