• 1925
• 1930
• 1939
• 1948
• 1949
• 1955
• 1956
• 1960
• 1967
• 1970
• 1975
• 1980
• 1987
• 1988
• 1993
• 1995
• 1996
• 1997
• 2000
• 2001
• 2002
• 2003
• 2008

2003

Introduction of the 4th generation intermediate diaphragms with improved material transport outside the air flow. First diaphragms according this new principal are manufactured.

Utility model registration for the specification "Rohrmühlen-Trennwände" (tube mill diaphragms).