Assignee
Inventors
- Raymond C. Zowarka (10 patents)
- Damon A. Weeks (2 patents)
- William F. Weldon (37 patents)
- John H. Gully (8 patents)
- Jim L. Upshaw (6 patents)
- Mike L. Spann (2 patents)
- Dennis R. Peterson (10 patents)
US Patent 4884489 · Granted Dec 5, 1989