Inventor: Ault, James Robert
Inventor: Ault, James Robert
Inventor: Jacobs, Henricus Cornelius Maria
Inventor: Jensen, Bent Juhl
Inventor: Skelton, Donald Alfred
Inventor: Kristiansen, Kell
Inventor: de Ruiter, Hendrik Marinus
Inventor: Beekenkamp, Annie Cornelia
Inventor: Beekenkamp, Annie Cornelia
Inventor: Beekenkamp, Annie Cornelia
Inventor: Ault, James Robert, Thomas, Catherine S.
Inventor: Jensen, Bent Juhl
Inventor: Jensen, Bent Juhl
Inventor: Smith, Donald Robert
Inventor: Smith, Donald Robert
Inventor: Niederlander, Andreas
Inventor: Hooijman, Aloysius A. J.