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US3312681A Cationic 1-alkyl-3-(2-hydroxy-1-naphthylazo) pyridinium dyes 失效
阳离子1-烷基-3-(2-羟基-1-萘基偶氮)吡啶鎓染料

Cationic 1-alkyl-3-(2-hydroxy-1-naphthylazo) pyridinium dyes
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