Perforated plank for the floor of a material drying bin
FIG. 1 is a top perspective view of a plank for a material  drying bin showing my new design; 
     FIG. 2 is an enlarged fragmentary top plan view thereof; 
     FIG. 3 is a side view thereof on an enlarged scale  relative to the showing in FIG. 1; 
     FIG. 4 is a top plan view thereof; 
     FIG. 5 is a side view thereof looking at the side opposite  the one shown in FIG. 3; 
     FIG. 6 is an end view thereof looking toward the left as  viewed in FIG. 4; and 
     FIG. 7 is a bottom plan view thereof.