| http://www.w3.org/ns/prov#value | - However, because such casements often vary in their dimensions, it is preferable to provide some sort of extension means on the frame structure 24 to allow for different sizes and variations of width to height ratios of casements so that a single structure 20 can be utilized for a variety of casement openings that vary from one another with regard to height to width ratios.
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