| http://www.w3.org/ns/prov#value | - The test device layers can comprise various porous, fibrous materials such as cellulose, papers, fleeces, felts, woven fabric and the like (see, for example, U.S. Pat. Nos. 3,802,842; 3,809,605; and 3,897,214, all of which are incorporated herein by reference).
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