US D317502 S
FIG. 1 is a side elevational view of a unipolar spiral coil electrode for monitoring the electrical activity of the brain, showing our new design, the broken line showing is for illustrative purposes only and forms no part of the claimed design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a front elevational view thereof; and
FIG. 5 is a bottom plan view thereof.