Assignee
Inventors
- Josef Nickl (27 patents)
- Armin Heckel (63 patents)
- Erich Muller (32 patents)
- Berthold Narr (37 patents)
- Johannes Weisenberger (47 patents)
- Wolfgang Eisert (24 patents)
- Thomas Müller (43 patents)
US Patent 4929754 · Granted May 29, 1990