Ketone: Ketone, any of a class of organic compounds characterized by the presence of a carbonyl group in which the carbon atom is covalently bonded to an oxygen atom. The remaining two bonds are to other carbon atoms or hydrocarbon radicals (R): Alcohols may be oxidized to give aldehydes, ketones, and carboxylic acids.
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Some phillumenists collect covers based on the company that made the matchbooks. In addition to Diamond, Atlas, D.D. Bean, Federal, Lion, Monarch, and Ohio all produced collectible covers and features. Many other collectors organize their covers based on category.