Inventor: Greyvenstein, Ockert F. C.
Inventor: Verhoef, Gijsbertus
Inventor: de Boer, Petrus
Inventor: de Boer, Petrus
Inventor: Durand, James Richard
Inventor: Zlesak, David Charles
Inventor: Stemkens, Henricus Godefridus Wilhelmus
Inventor: Membrey, Stephen, Jackson, Bryan
Inventor: Schuurbiers, Marinus Martinus Hendrikus