Inventor: van Veen, Johannes Gerardus
Inventor: Verduin, Henricus Gijsbertus Johannes
Inventor: van Elderen, Renier
Inventor: Verduin, Harry G. J.
Inventor: Verduin, Harry G. J.
Inventor: Verduin, Harry G. J.
Inventor: Verduin, Harry G. J.
Inventor: Verduin, Harry G. J.
Inventor: van Buren, Gert
Inventor: Whiting, Hubert F.
Inventor: Whiting, Hubert F.
Inventor: Whiting, Hubert F.