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I claim the ornamental design for a stackable wall block, as shown.
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FIG. 1 is a perspective view of a stackable wall block showing my new design.
FIG. 2 is a front view thereof.
FIG. 3 is a rear view thereof.
FIG. 4 is a bottom view thereof.
FIG. 5 is a top view thereof; and,
FIG. 6 is a side view thereof.
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| May 19 2006 | Rockwood Retaining Walls, Inc | (assignment on the face of the patent) | / | |||
| Feb 06 2007 | Rockwood Retaining Walls, Inc | Mortarless Technologies LLC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 019116 | /0834 | |
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