| http://www.w3.org/ns/prov#value | - The swing of claim 27, said first latch is disposed at said distal end of said first connecting arm, wherein said first latch is a self-locking latch and said blocking piece includes a sloped surface adapted for configuring said first latch from said engaged position to a disengaged position by engagement of said sloped surface with a corresponding surface of said retainer.
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