Masking unit for a bowling machine
FIG. 1 is a perspective view of my new design for a masking unit for a bowling machine; 
     FIG. 2 is a front elevation view thereof; 
     FIG. 3 is a rear elevational view thereof; 
     FIG. 4 is a left side elevational view thereof, the right side view being symmetrical to the left side view; and, 
     FIG. 5 is a top plan view thereof, the bottom plan view being symmetrical to the top plan view.