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The ornamental design for a alarm unit housing, as shown and described. |
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FIG. 1 is a front elevational view of an alarm unit housing showing my new design;
FIG. 2 is a left side elevational view thereof, with the right side being a mirror image;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top front perspective view thereof;
FIG. 5 is a top plan view thereof; and
FIG. 6 is a bottom plan view thereof.
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