| http://www.w3.org/ns/prov#value | - An umbrella frame according to claim 3, in which the joint is a ball-and-socket joint comprising a ball member and a socket member, the ball member including a neck attached to the first part of the shaft and the socket member being attached to the second part of the shaft, in which the socket is in the form of a cup open in a direction away from the second part and includes means for retaining th
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