| http://www.w3.org/ns/prov#value | - A thin film of a polyimide made from a polyimide precursor by forming a film of said precursor by the Langmuir-Blodgett technique and converting said precursor into polyimide, said precursor having at least 70% by mole of the recurring unit of the formula (1): ##STR42## wherein R1 is a tetravalent group having at least 2 carbon atoms, R2 is a bivalent group having at least 2 carbon atoms, and each
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