| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of the present invention; FIG. 2 is an exploded view of the present invention; FIG. 3 is an enlarged perspective view of the present invention; FIG. 4 is a side cross-sectional view showing that a shaft of a quick release set is engaged in first troughs; FIG. 5 is a view similar to FIG. 4 showing that a linking block is pushed upwardly to lin
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