Assignee
Inventors
- Andre Welter (12 patents)
- Harmut Fischer (1 patents)
- Leon Christiaens (3 patents)
- Albrecht Wendel (7 patents)
- Eugen Etschenberg (19 patents)
- Norbert Dereu (12 patents)
- Peter J. Kuhl (7 patents)
- Eric Edward Graf (2 patents)
US Patent 4873350 · Granted Oct 10, 1989