Wheelchair base frame
FIG. 1 is a planar view of my wheelchair base frame, shown from above; 
     FIG. 2 is a perspective view of my wheelchair base frame, shown obliquely from the rear side and slightly from above; 
     FIG. 3 is a side view of my wheelchair base frame, from the right side; 
     FIG. 4 is a planar view of my wheelchair base frame, shown from below, and from the opposite side as compared to the view shown in FIG. 1. 
     FIG. 5 is a front view of my wheelchair base frame; and, 
     FIG. 6 is a side view of my wheelchair base frame, from the left side, and from the opposite side as compared to the view shown in FIG. 3.