Inventor: van der Meer, Hans
Inventor: van der Meer, Hans
Inventor: Verduin, Harrie
Inventor: Verduin, Harrie
Inventor: van der Meer, Hans
Inventor: Verduin, Harrie
Inventor: Verduin, Harrie
Inventor: Verduin, Harrie
Inventor: Verduin, Harrie
Inventor: Verduin, Harrie
Inventor: Verduin, Harrie
Inventor: Verduin, Harrie
Inventor: Verduin, Harrie
Inventor: Jamieson, Richard
Inventor: van der Meer, Hans
Inventor: Verduin, Harrie
Inventor: van der Meer, Hans
Inventor: van Veen, Wilhelmus Franciscus
Inventor: Fulcher, Richard John