Inventor: Stemkens, Henricus Godefridus Wilhelmus
Inventor: Verschoor, Janus
Inventor: Kievit, Christa
Inventor: Kievit, Christa
Inventor: Kievit, Christa
Inventor: Kievit, Christa
Inventor: van Leeuwen, Jan
Inventor: Hansen, Hans A.
Inventor: Oliver, Charles G.
Inventor: Hogenboom, Jeroen