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The ornamental design for a dust mask holder, as shown and described. |
FIG. 1 is an isometric view of a first embodiment of the dust mask holder;
FIG. 2 is a side elevational view thereof, showing in phantom lines a dust mask with which the present invention is used;
FIG. 3 is a top plan view thereof;
FIG. 4 is front elevational view, showing the dust mask in broken lines;
FIG. 5 is a rear elevational view thereof;
FIG. 6 is a bottom view thereof;
FIG. 7 is isometric view of a second embodiment of the present invention;
FIG. 8 is a side elevational view thereof, showing in phantom lines a dust mask with which the present invention is used;
FIG. 9 is a top plan view thereof;
FIG. 10 is front elevational view, showing the dust mask in broken lines;
FIG. 11 is a rear elevational view thereof;
FIG. 12 is a bottom view thereof;
FIG. 13 is isometric view of a third embodiment of the present invention;
FIG. 14 is a side elevational view thereof, showing in phantom lines a dust mask with which the present invention is used;
FIG. 15 is a top plan view thereof;
FIG. 16 is front elevational view, showing the dust mask in broken lines;
FIG. 17 is a rear elevational view thereof;
FIG. 18 is a bottom view thereof;
FIG. 19 is isometric view of a fourth embodiment of the present invention;
FIG. 20 is a side elevational view thereof, showing in phantom lines a dust mask with which the present invention is used;
FIG. 21 is a top plan view thereof;
FIG. 22 is front elevational view, showing the dust mask in broken lines;
FIG. 23 is a rear elevational view thereof; and,
FIG. 24 is a bottom view thereof;
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