Assignee
Inventors
- Donald T. Hackworth (13 patents)
- Daniel W. Deis (10 patents)
- David Marschik (12 patents)
- Henry R. Schwenk (1 patents)
- Edward J. Shestak (3 patents)
- Carl J. Heyne (10 patents)
- Henry Riemersma (1 patents)
US Patent 4779070 · Granted Oct 18, 1988