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| US4623428 | 22 Oct 1984 | 18 Nov 1986 | Ciba-Geigy Corporation | Process for sizing paper with anionic hydrophobic sizing agents and cationic retention aids | | US4627889 | 23 May 1983 | 9 Dic 1986 | Ciba-Geigy Corporation | Process for sizing paper with anionic hydrophobic sizing agents and cationic retention aids |
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