| http://www.w3.org/ns/prov#value | - PRIOR ART STATEMENTThe following is a listing of the patents, publications or other information which the applicant believes to be the closest prior art of which he is aware:U.S. Pat. Nos. 2,043,464; 2,192,861; 2,261,449; 2,310,011; 2,327,551; 2,497,996; 2,632,194; 2,655,413; 2,755,495; 2,755,498; 2,777,144; 2,797,968; 3,162,887; 3,362,037; 3,760,450; 3,778,860.
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