Combined knockdown base and multiple seat unit for a picnic table
FIG. 1 is a side elevational view of a combined knockdown base and multiple seat unit for a picnic table, showing my new design; 
     FIG. 2 is a top plan view; 
     FIG. 3 is a bottom plan view; 
     FIG. 4 is a fragmentary, greatly enlarged top plan view of the center of the base; and 
     FIG. 5 is a fragmentary, greatly enlarged bottom plan view of the center of the base.