Inventor: van Duijn, Jan Mark
Inventor: Greyvenstein, Ockert F. C.
Inventor: Hansen, Hans A.
Inventor: Fell, Jr., David N.
Inventor: Stemkens, Henricus Godefridus Wilhelmus
Inventor: Membrey, Stephen, Jackson, Bryan
Inventor: Stemkens, Henricus G. W.
Inventor: Unger, Christiaan