Assignee
Inventors
- Winfried Materne (4 patents)
- Bernard Schleper (7 patents)
- Josef Hibbel (9 patents)
- Volkmar Schmidt (14 patents)
- Bernhard Lieder (11 patents)
- Ulrich Gerhardus (7 patents)
- Heinrich Scheve (8 patents)
US Patent 4752303 · Granted Jun 21, 1988