Assignee
Inventors
- John W. Clitherow (38 patents)
- John Bradshaw (40 patents)
- John MacKinnon (18 patents)
- Duncan B. Judd (26 patents)
- David E. Bays (29 patents)
- Roger Hayes (15 patents)
- Andrew Pearce (6 patents)
US Patent 4670448 · Granted Jun 2, 1987