Assignee
Inventors
- Ian S. Groves (3 patents)
- David R. Guard (3 patents)
- John G. Bunting (2 patents)
- Christopher E. Rowlands (1 patents)
- Edwin J. Powter (2 patents)
- David William James Holmes (52 patents)
- Graham J. Trott (1 patents)
US Patent 4456789 · Granted Jun 26, 1984