Contact sensor

FIG. 1 is a front, top, left-side perspective view of a contact sensor;

FIG. 2 is a front, top, left-side perspective view thereof with a disclaimed portion removed;

FIG. 3 is a back, bottom, right-side perspective view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left-side elevation view thereof;

FIG. 7 is a left-side elevation view thereof with the disclaimed portion removed;

FIG. 8 is a right-side elevation view thereof;

FIG. 9 is front elevation view thereof; and,

FIG. 10 is a back elevation view thereof.

The dashed broken lines depict portions of the contact sensor that form no part of the claimed design.