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The ornamental design for a plough anchor, as shown and described. |
FIG. 1 is an upper perspective view of a plough anchor showing my new design;
FIG. 2 is a lower perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a side view thereof:
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
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