IC 016. US 002 005 022 023 029 037 038 050. G & S: Papers which change color and optical characteristics, papers containing particle suspensions which change color and optical characteristics, blackboards which change color and optical characteristics, blackboards containing particle suspensions which change color and optical characteristics
IC 017. US 001 005 012 013 035 050. G & S: Films which change color and optical characteristics, films containing particle suspensions which change color and optical characteristics
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