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			 The ornamental design for a breathing mask, as shown and described.  | 
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FIG. 1 is a front elevational view of the breathing mask showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a perspective view thereof.
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| Patent | Priority | Assignee | Title | 
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