Inventor: de Boer, Petrus
Inventor: de Boer, Petrus
Inventor: van der Velden, Josephus M.
Inventor: Schoenmakers, Kees
Inventor: Cornelis, Daniel
Inventor: Van Andel, Otto Jan Robert
Inventor: Van Andel, Otto Jan Robert
Inventor: Ison, William G.
Inventor: Herrick, Robert D.
Inventor: Mills, Wayne J., Hampton, Katherine L.
Inventor: Hofland, G. Jack
Inventor: Bradford, Virginia
Inventor: McGuire, Orvid E.
Inventor: Barcafer, Ellis H.
Inventor: Niedfeldt, Carl J.