Inventor: Greyvenstein, Ockert F. C.
Inventor: van der Velden, Josephus M.
Inventor: Stemkens, Henricus Godefridus Wilhelmus
Inventor: Membrey, Stephen, Jackson, Bryan
Inventor: Stemkens, Henricus G. W.
Inventor: Unger, Christiaan
Inventor: Schoenmakers, Kees
Inventor: Cornelis, Daniel
Inventor: Unger, Michael Helmet