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The ornamental design for a combined fire detector and carbon monoxide detector, as shown. |
FIG. 1 is a front plan view of a combined fire detector and carbon monoxide detector of the present invention;
FIG. 2 is a back plan view of a combined fire detector and carbon monoxide detector of FIG. 1;
FIG. 3 is a left side plan view of a combined fire detector and carbon monoxide detector of FIG. 1;
FIG. 4 is a right side plan view of a combined fire detector and carbon monoxide detector of FIG. 1;
FIG. 5 is a top plan view of a combined fire detector and carbon monoxide detector of FIG. 1; and,
FIG. 6 is a bottom plan view of a combined fire detector and carbon monoxide detector of FIG. 1.
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