| http://www.w3.org/ns/prov#value | - Apparatus according to claim 21 including a releasable attachment of the pelvic support to the upper brace arm which includes an upper bearing surface projecting outwardly from the pelvic support and on which the upper brace arm is releasably secured for rotating the upper brace arm point of attachment laterally on the upper bearing surface to adjust its rotational position; and
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