Inventor: Greyvenstein, Ockert F. C.
Inventor: Saul, Robert Mark
Inventor: Stemkens, Henricus Godefridus Wilhelmus
Inventor: Membrey, Stephen, Jackson, Bryan
Inventor: Stewart, Ian Angus
Inventor: Stemkens, Henricus G. W.
Inventor: Unger, Christiaan
Inventor: Bremer, Hinrich
Inventor: Troelstra, Johan
Inventor: Bakhuijzen, Arie