| http://www.w3.org/ns/prov#value | - sing roller 124 includes a central core 201 of a thermally isolating material, such as may be comprised of a solid, foamed, or particulate material, such as polyurethane, polystyrene, glass fibre, rubber, porcelain, mica, asbestos, cork, or kapok, or even air suitably enclosed or otherwise controlled.
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