Assignee
Inventors
- Isaac Heertje (4 patents)
- Hendricus Arnoldus Cornelis Hendrickx (1 patents)
- Albertje Johanna Knoops (4 patents)
- Elias Cornelis Royers (2 patents)
- Hessel Turksma (8 patents)
- Leendert Hendrik Wesdorp (16 patents)
US Patent 5652011 · Granted Jul 29, 1997