| http://www.w3.org/ns/prov#value | - mono- or co-polymer of the unit components represented by the general formula: ##STR4## wherein R is a hydrogen atom or a methyl group; A is ##STR5## wherein R.sub.1, R.sub.2 and R.sub.3 each are lower alkyl, phenyl or benzyl groups, and further R.sub.2
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