| http://www.w3.org/ns/prov#value | - A device for exercising comprising a base, a four walled structure joined to and projecting upwardly from said base, one of said walls being shorter than the others to provide an opening adjacent said base, deflecting means in said structure adjacent said base and said opening, said means serving to direct a ball or other falling object outwardly through said opening, when said ball or object is i
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