| http://www.w3.org/ns/prov#value | - The grooves 9 and 10 are in alignment with each other so that a yieldable retainer strip 11 made of corrugated cardboard or other suitable material can be placed in the grooves 9 and 10 and the pieces 5 and 6 fitted together as shown in FIGS. 1, 4 and 5.
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