Inventor: de Boer, Petrus
Inventor: de Boer, Petrus
Inventor: Aughenbaugh, Ernest S.
Inventor: Van Andel, Otto Jan Robert
Inventor: Van Andel, Otto Jan Robert
Inventor: Herrick, Robert D.
Inventor: Pezzulla, Anna M.
Inventor: Mills, Wayne J., Hampton, Katherine L.
Inventor: Briggs, Carroll G.
Inventor: Hofland, G. Jack
Inventor: Briggs, Carroll G.
Inventor: Ernest D. Williams