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Tokuyama Corp
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Tokuyama Corp
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Publication of JPS6366186ApublicationCriticalpatent/JPS6366186A/ja
Publication of JPH0586955B2publicationCriticalpatent/JPH0586955B2/ja
Indolino-spiro-oxazine photochromic compounds with five-membered rings, method for their preparation, photochromic compositions and articles containing such compounds