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| US4199394 | 3 Aug 1978 | 22 Apr 1980 | | Ribbed fiber panel and means and method of manufacture |
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| US4921643 | 24 Jun 1988 | 1 May 1990 | Richard R. Walton | Web processing with two mated rolls |
| US7963899 | 13 Jul 2001 | 21 Jun 2011 | The Proctor & Gamble Company | Continuous in-line pleating apparatus and process |
