Inventor: Greyvenstein, Ockert F. C.
Inventor: Stemkens, Henricus Godefridus Wilhelmus
Inventor: Membrey, Stephen, Jackson, Bryan
Inventor: de Groot, Leonardus S. J.
Inventor: Stemkens, Henricus G. W.
Inventor: Unger, Christiaan
Inventor: van Diemen, Hubertus T.
Inventor: Baars, Johannes
Inventor: Baars, Johannes