an elongated, generally U shaped cover strip having an outer panel and opposite side portions extending at right angles to and inwardly from {TAIL ~ opposite sides} of said panel, said cover strip movable into overlapping relation to said {HEAD ~ clip members} with said side portions movable into superimposed relation to said opposite sidewalls, each of said side portions having an internal, outwardly facing ridge engageable with said external ridge on each of said sidewalls to retain said cover strip in position over said clip members 
an elongated , generally U shaped cover strip having an outer panel and opposite side portions extending at right angles to and inwardly from { TAIL ~ opposite sides } of said panel , said cover strip movable into overlapping relation to said { HEAD ~ clip members } with said side portions movable into superimposed relation to said opposite sidewalls , each of said side portions having an internal , outwardly facing ridge engageable with said external ridge on each of said sidewalls to retain said cover strip in position over said clip members
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