Piercing valve stem assembly

The ornamental design for a piercing valve stem assembly, as shown and described.

FIG. 1 is a perspective view of a piercing valve stem assembly showing my new design;

FIG. 2 is a front plan view thereof, the rear, top and bottom being mirror images;

FIG. 3 is a left plan view thereof; and,

FIG. 4 is a right plan view thereof.

Patent	Priority	Assignee	Title
2881011,
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24199,

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