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The ornamental design for a piston working fixture, as shown and described. |
FIG. 1 is a perspective view of a piston working fixture embodying my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a side elevational view taken from the right of FIG. 3, the side opposite being a mirror image thereof;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a bottom plan view thereof.
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