Inventor: de Boer, Petrus
Inventor: Noodelijk, Robert
Inventor: Beers, Catharina Maria
Inventor: Beers, Catharina Maria
Inventor: Beers, Catharina Maria
Inventor: de Boer, Petrus
Inventor: Beers, Catharina Maria
Inventor: Beekenkamp, Annie Cornelia
Inventor: Noodelijk, Robert
Inventor: Beekenkamp, Annie Cornelia
Inventor: Beekenkamp, Annie Cornelia
Inventor: Beers, Martinus Petrus
Inventor: Beers, Martinus Petrus
Inventor: Van Andel, Otto Jan Robert
Inventor: Van Andel, Otto Jan Robert
Inventor: McDaniel, Robert G.
Inventor: Herrick, Robert D.
Inventor: Mills, Wayne J., Hampton, Katherine L.