Inventor: de Boer, Petrus
Inventor: de Boer, Petrus
Inventor: de Looff, Tonny M.
Inventor: de Looff, Tonny M.
Inventor: Van Blokland, Robbert G. C.
Inventor: Meiland, Jacobus Hendrikus
Inventor: Van Andel, Otto Jan Robert
Inventor: Blay, John William, Blay, Violet Marilyn
Inventor: Van Andel, Otto Jan Robert
Inventor: Van der Salm, Catherine Joy, Freeman, Judith Louise
Inventor: Hoff, Petrus M. M.
Inventor: Hoff, Petrus M. M.
Inventor: Hoff, Petrus M. M.