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http://tobaccodocuments.org/preps/2081694432-4454.html

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US Patent + Trademark Office; Bryant, H.G., J.R.; Norman, V. "United States Patent 4,055,191 Tobacco Composition". 13 Feb 2001. Bates: 2081694432-2081694454.
http://tobaccodocuments.org/preps/2081694432-4454.html