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The ornamental design for a construction beam, as shown. |
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FIG. 1 is a perspective view of a construction beam showing my new design;
FIG. 2 is an end elevational view thereof;
FIG. 3 is a front view thereof viewed in the direction of arrow 3 of FIG. 2; and
FIG. 4 is a rear view thereof viewed in the direction of arrow 4 of FIG. 2.
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