Ahti Syrjanen

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Valkeakoski, SF

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Patents Grantslast 30 patents

Information Patent Grant
Procedure and apparatus for preparation of hot groundwood
- Patent number 4,009,835
- Issue date Mar 1, 1977
- Yhtyneet Paperitehtaat Oy Jylhavaara
- Ahti Syrjanen
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE