References
- 1. U. S. Patent 3, 667, 479.
- 2. U.S. Patent 3, 526,904.
- 3. Lowry, R. D.: Mod. Packag. 36 (1962) 160.
© 2014 R. A. Crellin, G. O. Brooks, H. G. Horsewell, published by Institut für Tabakforschung GmbH
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