Olli Tapio Valttila

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Niittykumpu, SF

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Patents Grantslast 30 patents

Information Patent Grant
Delignification and bleaching of wood pulp with oxygen in the prese...
- Patent number 3,951,732
- Issue date Apr 20, 1976
- Osakeyhtio; A. Ahlstrom
- Eero Vilhelm Sjostrom
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE