Air brake stroke length indicator
FIG. 1 is a front elevational view of an air brake stroke length indicator showing my new design; 
     FIG. 2 is a top plan view thereof; 
     FIG. 3 is a right side elevational view thereof, the left side being a mirror image; 
     FIG. 4 is a bottom plan thereof; and, 
     FIG. 5 is a sectional view thereof taken on line 5--5 of FIG. 1.