Motor-driven screw driver
FIG. 1 is a front elevational view of a motor-driven screw driver showing our new design; 
     FIG. 2 is a rear elevational view thereof; 
     FIG. 3 is a top plan view thereof; 
     FIG. 4 is a bottom plan view thereof; 
     FIG. 5 is a left side elevational view thereof; 
     FIG. 6 is a right side elevational view thereof; 
     FIG. 7 is a sectional view thereof taken along the line 7--7 in FIG. 5; 
     FIG. 8 is a sectional view thereof taken along the line 8--8 in FIG. 1.