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The ornamental design for a ventilator, as shown and described.
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FIG. 1 is a front perspective view of a ventilator showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a side elevational view thereof;
FIG. 4 is a top plan view thereof; and,
FIG. 5 is a bottom plan view thereof.
Angers, Mary Catherine, Papp, Barry Matthew
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