prov:value
| - (6) The polymers containing units of the formula (VIII) and described in French Pat. Nos. 1,400,366. ##STR13## in which R represents a hydrogen atom or a CH3 O--, CH3 CH2 O-- or phenyl radical, R1 denotes hydrogen or a lower alkyl radical, such as methyl or ethyl, R2 denotes hydrogen or a lower alkyl radical, such as methyl or ethyl, and R3 denotes a lower alkyl radical, such as methyl or ethyl, o
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