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			 The ornamental design for a adjustable valve stem for high air muffler, as shown.  | 
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FIG. 1 is a perspective view showing my new design.
FIG. 2 is a front view thereof.
FIG. 3 is a rear view thereof.
FIG. 4 is a right end view thereof.
FIG. 5 is a left end view thereof.
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
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