Roller skate
FIG. 1 is a left side elevational view of a roller skate, the right side elevational view thereof being identical; 
     FIG. 2 is a top plan view thereof; 
     FIG. 3 is a front elevational view thereof; 
     FIG. 4 is a rear elevational view thereof; 
     FIG. 5 is a bottom plan view thereof. 
     The broken line showing of the boot in FIG. 1 is for illustrative purposes only and forms no part of the claimed design.