Casing for a drug delivery system
FIG. 1 is a front elevational view of a casing for a drug delivery system embodying our new design; 
     FIG. 2 is a right end elevational view thereof; 
     FIG. 3 is a top plan view thereof; 
     FIG. 4 is a rear elevational view thereof; 
     FIG. 5 is a left end elevational view thereof; and 
     FIG. 6 is a bottom plan view thereof.