Claims (1)
Claim 1 (Independent)
The ornamental design for illumination device, as shown and described.
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FIG. 1 is a perspective view of an illumination device; and,
FIG. 2 is another perspective view of the illumination device, shown in a position of use with two lamps installed.
The broken lines illustrating lamps in FIG. 2 are included to illustrate environmental structures and form no part of the claimed design.