Mask ventilation assist device

The ornamental design for a mask ventilation assist device, as shown and described.

FIG. 1 is a top view of a mask ventilation assist device, showing my new design;

FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1; and,

FIG. 3 is an enlarged view of the portion encircled in FIG. 2.

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