| http://www.w3.org/ns/prov#value | - The stopwatch 20 is preferably portable and self-contained in a small, protective, impact-resistant housing 22 which may be made of any suitable metal, plastic or other material and which has a generally circular outer rim 24 less than three inches in diameter and preferably two or more inches in diameter so that the stopwatch can be very comfortably held in the operator's hand.
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