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The ornamental design for an oxygen mask, as shown and described. |
FIG. 1 is a side perspective view of the oxygen mask of my claimed design;
FIG. 2 is a front elevational view thereof
FIG. 3 is a left side elevational view thereof, the right side elevational view being a mirror image thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof; and,
FIG. 6 rear elevational view thereof.
Black, Richard A., Rosiello, Richard L.
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