The ornamental design for an external heatreusingdevice, as shown and described.
FIG. 1 is a perspective view of an external heat reusing device showing our new design.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a rear elevational view thereof.
FIG. 4 is a left side elevational view thereof.
FIG. 5 is a right side elevational view thereof.
FIG. 6 is a top plan view thereof.
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view of another aspect of the “external heat reusing device”, showing parts of the “external heat reusing device” which is in a state of use.
In the drawings, the broken lines depict unclaimed subject matter only and form no part of the claimed design and the shade lines in the figures show contour and not surface ornamentation.