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The ornamental design for a masonry block, as shown. |
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FIG. 1 is a top perspective view of a masonry block in accordance with the present invention;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a side elevation;
FIG. 4 is an end elevation;
FIG. 5 is a bottom elevation; and
FIG. 6 is a top elevation.
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