US D591576 S1
The ornamental design for a pneumatic fastener, as shown and described.
FIG. 1 is a left/top perspective view of the pneumatic fastener.
FIG. 2 is a left side elevational view thereof.
FIG. 3 is a right side elevational view thereof.
FIG. 4 is a top view thereof.
FIG. 5 is a bottom view thereof.
FIG. 6 is a front elevational view thereof; and,
FIG. 7 is a rear elevational view thereof.
The proprietary trademark shown in broken lines is for illustrative purposes only and forms no part of the claimed design.