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The ornamental design for a collapsible head rest, as shown and described. |
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FIG. 1 is a perspective view of a collapsible head rest showing my design;
FIG. 2 is a bottom view of the device illustrated in FIG. 1;
FIG. 3 is a top view of the device illustrated in FIG. 1;
FIG. 4 is a front view of the device illustrated in FIG. 1;
FIG. 5 is a left side elevational view illustrating the device in FIG. 1;
FIG. 6 is a back view of the device illustrated in FIG. 1;
FIG. 7 is a right side elevational view illustrating the device in FIG. 1;
FIG. 8 is a perspective view showing an alternative embodiment of my invention;
FIG. 9 is a bottom view of the alternative embodiment of my invention;
FIG. 10 is a top view of the alternative embodiment of my invention;
FIG. 11 is a front view of the alternative embodiment of my invention;
FIG. 12 is a left side elevational view of the alternative embodiment of my invention;
FIG. 13 is a back view of the alternative embodiment of my invention; and
FIG. 14 is a right side elevational view of the alternative embodiment of my invention.
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