| http://www.w3.org/ns/prov#value | - Such foam block can be made from any suitable material such as foam polyurethane, a foamed latex rubber, etc., and the foam block has a multitude of small interconnecting cells therein whereby the block and its container in normal form include a relatively large volume of air therein which air can be expelled therefrom as a gust by any sudden compression of the foam block.
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