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			 The ornamental design for an inhalation mask, substantially as shown.  | 
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FIG. 1 is a front elevational view of an inhalation mask showing my new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a transverse sectional view thereof and is taken along line 3--3 of FIG. 1;
FIG. 4 is a right side elevational view thereof; the left side view being a mirror image of FIG. 4;
FIG. 5 is a bottom plan view thereof; and
FIG. 6 is a rear elevational view thereof.
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