Assignee
Inventors
- Guenter Ries (13 patents)
- Klaus-Peter Juengst (3 patents)
- Siegfried Foerster (2 patents)
- Franz Graf (8 patents)
- Wolfgang Lehmann (30 patents)
- Karl-Heinz Unkelbach (12 patents)
- Gottfried Dueren (1 patents)
US Patent 4315816 · Granted Feb 16, 1982