Concrete block
FIG. 1 is a top perspective view of a concrete block showing my new design; 
     FIG. 2 is a side elevational view taken from the right of FIG. 1; 
     FIG. 3 is a front elevational view taken from the left of FIG. 2; 
     FIG. 4 is a top view of the concrete block shown in FIG. 1; 
     FIG. 5 is a rear elevational view taken from the right of FIG. 2; 
     FIG. 6 is a view from the bottom of the concrete block shown in FIG. 1; 
     FIG. 7 is a top perspective view of a second embodiment of a concrete block showing my new design; 
     FIG. 8 is a top perspective view of a third embodiment of a concrete block showing my new design; 
     FIG. 9 is a top perspective view of a fourth embodiment of a concrete block showing my new design; 
     FIG. 10 is a top perspective view of a fifth embodiment of a concrete block showing my new design; and, 
     FIG. 11 is a top perspective view of a sixth embodiment of a concrete block showing my new design.