Smoke detector
FIG. 1 is a front, top and right side perspective view of a smoke detector showing our new design; 
     FIG. 2 is a rear elevational view thereof with the smoke detector inverted; 
     FIG. 3 is a front elevational view thereof; 
     FIG. 4 is a left side elevational view with the smoke detector upended; 
     FIG. 5 is a right side elevational view thereof in the position of FIG. 4; and 
     FIG. 6 is a bottom plan view thereof.