| http://www.w3.org/ns/prov#value | - a housing including a fixed portion and a moveable portion, wherein a user grips an outer surface of said housing when using said device; an engageable control operative to receive a user's finger through an opening in said moveable portion in said housing such that said moveable portion at least partially surrounds said engageable control, said engageable control outputting a signal when engaged
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