Assignee
Inventors
- Leonard C. Vercellotti (21 patents)
- Arthur A. Anderson (17 patents)
- David A. Christiansen (7 patents)
- Dannis R. Johnson (6 patents)
- Laurence R. Brickner (4 patents)
- Unknown
- John Leddy (46 patents)
US Patent 4885564 · Granted Dec 5, 1989