Inventor: de Boer, Petrus
Inventor: de Boer, Petrus
Inventor: van Gaalen, Rene, de Boer, Huibert Anne
Inventor: de Boer, Huibert Anne
Inventor: de Boer, Huibert Anne, van Gaalen, Rene
Inventor: de Boer, Huibert Anne
Inventor: Van Andel, Otto Jan Robert
Inventor: Van Andel, Otto Jan Robert
Inventor: Ruigrok, Wouter
Inventor: Herrick, Robert D.
Inventor: Mills, Wayne J., Hampton, Katherine L.
Inventor: Hofland, G. Jack
Inventor: Niedfeldt, Carl J.