Inventor: de Looff, Tonny M.
Inventor: de Looff, Tonny M.
Inventor: Stevenson, John
Inventor: Blay, John William, Blay, Violet Marilyn
Inventor: Westhoff, Heinrich
Inventor: Ritchie, John Stanley, Ritchie, Kathleen Anne
Inventor: Van der Salm, Catherine Joy, Freeman, Judith Louise
Inventor: Hoff, Petrus M. M.
Inventor: Hoff, Petrus M. M.
Inventor: Hoff, Petrus M. M.
Inventor: Hoff, Petrus M. M.
Inventor: Hoff, Petrus M. M.
Inventor: Hoff, Petrus M. M.
Inventor: Hoff, Petrus M. M.
Inventor: McRae, Judith F.
Inventor: Hoff, Petrus M. M.